Hi-Tech Green Energy Sdn Bhd
Unit 88, Menara Shell,
Level 19, Jalan Tun
50470 Kuala Lumpur,
+603-2718 5659
+603-9226 2276



1) How do I make a choice for windows and doors when choosing between aluminium and timber?

The selection of windows and doors can be one of the most difficult decisions for owners during construction. The choice between aluminium and timber is a personal one, with considerations including the style of the house, maintenance, energy conservation and price factoring in.

  • Slim line
  • 17 powder coated colours, including a wood grain finish
  • Minimal maintenance
  • Trend Thermashield glass options to improve energy efficiency
  • Heavier section profile
  • Option to paint internal and external faces (to match/compliment style of home)
  • Higher thermal quality, improving energy efficiency
  • Trend Thermashield glass options to improve energy efficiency
Pricing is comparative; the most critical decision to make is what suits your project design. Cost is a short term decision, and Trend products will be a low maintenance, high quality selection to complement any home for years to come.


1) Can you please supply me with some information why Trend's Xtreme Bushfire Windows & Doors products can be used in bushfire zones?

“There are now five construction sections in the proposed new Standard instead of three in the current 1999 edition of AS 3959. Section 3 covers general issues such as attached buildings and clarifies that there are no special construction requirements for buildings assessed in the Low category of bushfire attack. Section 4 addresses the Medium category of bushfire attack, which equates to ember protection and a radiant heat range of up to 12.5 kW/m2. Sections 5, 6 and 7 cover the High, Very High and Extreme categories of bushfire attack with radiant heat levels ranging from 12.5 kW/m2 to 40 kW/m2. Section 8 covers Flame Zone based on radiant heat levels in excess of 40 kW/m2 together with flame contact to the building.

The construction requirements include the application of fire resistant construction in order to maximise protection against buildings assessed in the Flame Zone category of bushfire attack.” 

Extensive testing was carried out at CSIRO laboratories, and has shown that Trend’s Xtreme product range of windows and doors withstands the extreme heat generated by extreme range 40kW/m2 and passes the relevant testing regime.

Building in bushfire prone areas is being upgraded and increasingly enforced in areas where the risk is evident. Under the new AS3959 – Building in Bushfire Prone Areas which is being released later this year the bushfire zones will be rated by kilowatts (kW).

2) I have noticed the letters BAL appear when I am looking at bush fire rated windows. What does BAL stand for?

BAL means Bushfire Attack Level. There are six Bushfire Attack levels from low to extreme. 

The following shows the six bushfire attack levels and their predicted risk levels:

BAL-Low: This is insufficient risk to warrant specific construction requirements – Risk Level -Very low.

BAL-12.5: Ember attack- Risk Level – Low.

BAL-19: This is insufficient risk to warrant specific construction requirements – Risk Level – Moderate.

BAL-29: Increasing levels of ember attack and burning debris ignite by windborne embers together with radiant heat exposure between 12.5 and 19kW/m2 – Risk Level – High.

BAL-40: Increasing levels of ember attack and burning debris ignite by windborne embers together with radiant heat exposure between 29 and 40kW/m2 – Risk Level – Very High.

BAL-FZ: Direct exposure to flames from fire front in addition to radiant heat exposure of Extreme greater than 40kW/m2 and ember attack- Risk Level – Extreme.

3) Can you please tell me what is the highest rating your timber products achieve for bushfire prone areas?

In bushfire areas our timber products Meranti rates to BAL-12.5 and we will also use New Guinea Rosewood for Bushfire areas which rates to BAL-19.

Otherwise we suggest you use our aluminium Xtreme Bushfire windows and doors range which rates upto BAL-FZ.

Energy Efficiency

1) What is WERS?

WERS is aimed at helping you, the consumer, to save money on your energy bills and contribute to a better environment.

The computer software used to generate the energy rating will depend on which state the project is built in. All of the software programs (eg Basix, First Rate, BERs) achieve the same outcome.

For a window manufacturer to obtain window star ratings they have to have their products tested and assessed by an recognised rating organisation that has been accredited by the AFRC 

The window energy ratings for heating and cooling rank the window against alternatives, using a five-star scale based on 27 ‘generic’ window types. The generic windows range from very low performance to very high performance in heating or cooling. The ratings apply to the effect of the whole window including the relative contributions of glass and frame.

The energy ratings are based on a window or door’s U-value and solar heat gain co-efficient (SHGC) figure. The lower the U value the better the insulating performance for a home and the lower the SHGC measures how well the glass product blocks out heat caused by sunlight.

When shopping for windows and doors you will start to see the following label:

WERS energy ratings are based on a basic five star rating from 0 to 5 stars. No stars indicate that the window is a very poor performer in relation to energy efficiency, whereas higher ratings, such as a five stars rating indicates excellent performance in relation to energy efficiency and comfort. Depending on the climate conditions you live in determines the types of system you require for your home, eg in a cold climate area you need a heating system, in a hot climate area a cooling system and in a mixed climate a mixture of both.

Custom ratings are where window manufacturer products are individually tested and assigned star ratings. Custom rated products frequently exceeds that of the nearest equivalent generic product.

Ensure that any window and door products you purchase are energy rated and comply with WERS. All Trend Windows and Doors are listed on WERS’ website.


2) What is NFRC and what has it got to do with WERS?

NFRC ratings are simulated through a computer program using advanced thermal simulation programs. WERS ratings utilises the NFRC ratings giving a full rating for the whole window system (includes frame, glass type, sealing system etc). The window/door products are certified by taking the u-value, SHGC and air infiltration to generate a star rating and percentage rating.

Window/Door manufacturers who have their products audited and are compliant will display the WERS logo or carry a WERS compliant label on their window/door products.

3) What is Thermashield?

Thermashield is Trend’s registered brand name for a collection of product ranges utilising various glazing options to help achieve the required window energy ratings for your home under the new government regulations.

The technologically advanced properties of Trend Thermashield energy efficiency systems offer a much more precise way to shield your home from weather extremes. Trend also makes it easy for you to evaluate the level of protection you require for each specific window and door, and to choose accordingly. In turn, this translates into cost savings by reducing heating and cooling bills.

Trend Thermashield means greater control, bigger savings, and most importantly, one less thing to worry about.


1) Can you explain some of the differences in the types of glass that are available for windows and doors?

There are many different types of glass available for windows and doors, for varied uses and requirements. 

Below is some of the different types are glass and what they are used for.

Float Glass: Clear glass used in windows to seal out the weather, and meet standard glazing requirements.

Obscure Glass: Used generally in bathrooms, toilets etc. to provide privacy, eg Spotswood, Satinlite.

Patterned Glass: Provides fashionable and functional alternatives for room dividers, door, side lites and feature areas.

Toughened Glass: Used in doors, or where safety is important, it is approximately 4 to 5 times stronger than float glass of equal thickness, making it far more resistant to impact. If broken, the toughened glass disintegrates into tiny, relatively harmless fragments, and as such is considered a safety glass for hazardous glazing locations.

Laminated Glass: Used in doors, or where safety is important, it consists of two or more sheets of glass with a plasticised polyvinyl butyl interlayer between to produce a permanent sandwich. Glass will crack but not break, and is approximately 2 – 2½ times stronger than float glass. Laminated glass is also used for its acoustic properties.

Tinted glass: Usually in Grey, Bronze or Green float, used to reduce summer heat coming into a room through the window.

Low E Glass: Used to reduce energy bills year round. It greatly reduces heat intrusion in summer and assists in keeping in the generated heat during winter. Special Low E coating on the glass means insulation from both heat and cold. In winter it keeps over a third more heat in a room. In summer it works the other way, to halve the sun‘s direct heat entering through the window, eg Comfortplus, Trend Low E.

Double glazed (insulated) glass units: Used to reduce energy bills year round, particularly in colder climates. Consists of two panes of glass separated by an aluminium spacer – profile and hermetically sealed around the periphery. Insulated glass units have a dual seal between the panes of glass and the spacer. The air space between the panes of glass provides the required thermal and sound insulation. For even better insulation they can be supplied as argon gas filled.

General terms used in regards to types of glass are:

• Transparent – Transmitting light, easily seen through.

• Obscure – Indistinct viewing not readily seen through.

• Opaque – Impenetrable to light, not transmitting light through.

• Translucent – Diffused light transmittance, not see through.

2) Why do my doors require a motif displayed across the glass? They look better without them.

Motifs are required for the following:

• A glass doorway, eg sliding door, bifold door, hinged door must be fitted with Safety A glass or laminated glass

• An opening between inside and outside of a building, eg a full glass fixed panel

• Any glazing that can result in human impact, causing any type of bodily harm to a human being.

In other words, glazing that conforms to the following and shall not be considered to be capable of being mistaken for a doorway or opening:

1) The glass size width is less than or equal to 500mm;

2) The glass size height is less than or equal to 1000mm;

3) The lowest glass sightline is higher than 500mm above the floor level in residential buildings

4) Where a crash/chair rail, handrail or transom is provided and located with its upper edges not less than 700mm or its bottom edge not more than 1000mm above the floor level

This means motifs are placed on glass where,

1) The glass size width is more than 500mm; and

2) The glass size height is more than 1000mm;

3) The glass located within 700mm of the floor

3) I have dry cement on my window frames and glass and would like to get it off without damage to aluminium powdercoating or glass. Can you please help?

Use plenty of water and let it soak onto the cement. Gradually lift off the cement from the frame or glass using a sponge or rag.

Do not use any abrasive objects.

On Site Care & Maintenance – Instructions

Products & General

Products & general relate to frequently asked questions on both aluminium and timber products and general questions relevant to windows an doors.

1) I have old sliding doors and they don't slide properly. Why is this so and what do I need to do to prevent this happening?

It sounds like your sliding window and door rollers need to be changed due to wear and tear. Some tips on preventing rollers from dragging are to vacuum the sill regularly to get rid of dust, dirt and insects which cause a build up of grit in the rollers. On an annual basis, clean tracks by wiping with light machine oil, such as sewing machine oil, to assist with smoother operation.

2) I have very old double hung windows do not slide up and down anymore but fall when I try to open them?

This means that the window spirals/balances need to be changed. When you replace them it is advisable that you open the window (top and bottom sashes) on a regular basis (eg fortnightly) to help them last longer. Please review our installation instruction for double hung window spiral balances. There are different spiral sizes that take different weights. The spiral should have a coloured mark on it to indicate its weight range. You will need to replace the old spiral with the corresponding colour and length.

3) Can you explain how to measure windows and doors?

Our recommendation is that you get a licensed tradesperson to measure your windows and doors to ensure that all products fit correctly.

4) Why do I need an Accredited Assessor's report when building or renovating?

There are different assessment tools used by Accredited Assessors depending on which state you are in.

  • National House Energy Rating Scheme (NaTHERS)
  • Nationally – AccuRate Sustainablity by CSIRO
  • New South Wales – Basix
  • Queensland – BERS
  • Victoria – FirstRate

5) What is the difference between STC and Rw ratings?

STC and Rw are laboratory test results, used for acoustic ratings.

The STC abbreviation means Sound Transmission Class, it is the measurement of internal sound transmission, eg high frequencies. The number rating that is used to determine how much a material, eg glass window will resist sound travelling through the air (airborne sound transfer).

Rw abbreviation means weighted sound reduction index which uses airborne sound and is a scientific calculation, this is better for rating the attenuation of external low frequency noise, eg outside traffic travelling through a material, eg glass window.

This means a commercial window could have a STC rating of 30 but can be rated as 25 dB (decibel) for noise.



1) Can you please tell me the differences between Western Red Cedar and Meranti Timber?

The difference between two timber types cedar and meranti.

Western Red Cedar

WRC is a beautiful wood that has natural colouring in ambers, reddish cinnamons and rich browns, with a uniform, fine grained pattern. It is typically a more stable timber and has less movement between cold and hot weather conditions.

WRC is mainly imported from Canada from recognised sustainable forest management systems that conform to ISO-14001 as part of the CSAZ809 Canadian national standard.

WRC is an excellent thermal insulator, as well as having acoustic properties for absorbing and dissipating sound.

Staining WRC provides an excellent timber finish.


Meranti is a harder timber than WRC, with colour varying from a pale pink to dark red. It presents with an open, moderately coarse grain, lending itself to be stained for natural warmth. Smooth paint surfaces may require additional coats.

Meranti grows mainly in South East Asia. It will tend to move more with climate conditions, but being a hardwood, can withstand a lot more damage than WRC.

Meranti is pressure treated with a 25 year guarantee to inhibit rotting and attach from termites.

2) I have just received my delivery of timber windows, can you recommend how to best finish them. I want to have the colour of the timber to show through?

Trend supplies natural (not pre-treated) product to site, leaving finishing decisions ultimately to the owner.

There are a number of reputable paint/stain suppliers in the market each offering a range of suitable solutions to finishing of joinery products. We have listed some of them below along with their contact numbers and websites to assist with your decision.

All of the above suppliers have stock available on shelves at Bunnings Warehouses. They offer colour board displays, simulating final colour. They have a very good point of sale material, outlining the products available its uses and application on joinery.

Please Note: Where painted finishes are being used Trend does offer at extra cost a pre-primed finish ex factory. Be aware that product will still require an undercoat & final finish application after.

Please find below an extract from our warranty sheet, which also needs to be followed:

Timber products are to be sealed (within one (1) month of delivery) with two coats of paint, stain, or sealer to both faces and edge, including top and bottom. Exterior quality finishes in light reflective colours (not dark colours) must be applied to all products exposed to direct sunlight.

Additional notes:

It is critical that both top and bottom of all doors are well sealed to avoid moisture seeping up into the end grain of product and potentially causing bowing or swelling of stiles.

Where doors are exposed to sunlight, ensure both sides of door are finished in the same colour, to avoid bowing. The greater the weather exposure the lighter the colour should be.

With double hung windows ensure that the metal spring guides in jambs are not painted, as this will cause issues with operation of sashes.

Paint/stain suppliers all recommend coating of timber product immediately after delivery.

Opaque stain finishes have a longer life, and better uV protection than the semi clear finishes. Stain suppliers also recommend gloss finishes for better protection

Water based acrylic finishes in light colours, can in certain circumstances get a bleed through of stain from the timber. If this occurs apply an oil based undercoat to seal the bleeding stain.

3) We have Timber windows that have water stains on the sill, is this a problem & how can I remove them?

If water stains appear on window sills or up the stile of doors, most likely they were not adequately stained or painted, or the original stain or paint has broken down.

Dry the timber and sand back the marked areas. Re-stain or paint the window or door.

There are a number of reputable paint and stain suppliers in the market, each offering a range of suitable solutions to finishing of joinery products. Please refer to the timber finishes question.

4) Can you please tell me why my timber doors vary in colour, that is the grain and colour varies in the one piece of timber as well as from one door panel to another?

Timber, being a natural material, has a number of unique features varying from piece to piece.

Colour variations can range from light to dark, in some cases quite extremely. As the timber ages, it will mature in colour.  A clear stain will highlight the natural colour variations.

As trees are different, no two pieces of timber will be the same. This is to be expected, even from the same type of timber.

5) Can you please tell me what is the highest rating your timber products achieve for bushfire prone areas?

Currently Meranti timber products are rated to BAL-12.5 and Rosewood timber products are rated to BAL-19.

Trend recommends our aluminium Xtreme Bushfire windows and doors for high bushfire danger areas, which rate up to BAL-40.

6) What are black spots or marks appearing on timber?

Black spots or marks on timber are not fungi attack, but due to factors such as;

  • Raw linseed oil will leave a mass of black spots
  • Excess residue after brick clean down will leave black stains. This also affects any anodised finishing burning marks into the surface.
  • Steel wool used by some painters to achieve a smooth finish can leave particles in the soft grain, which will create black spots in damp conditions.
  • Builders cutting steel in close vicinity will imbed in the surface with the same results. Even steel particles in sand can be wind blown into surfaces.

Black marks can be removed with oxalic acid, please follow the manufacturers’ instructions and safety requirements.

7) Does Trend Windows & Doors use engineered timber in products?

With the aim to bring a better quality timber product to the market, Trend has sourced engineered timber components.

These components are designed to minimise visual difference from solid timber components and reduce twisting and bowing.

Some components in timber products are more susceptible to movement than others. While timber is dried and machined into components, it still behaves like a tree. Direct sun will tend to dry timber while rain will make it take on more moisture. Sometimes this variance is not consistent over the full length of the component. The sun may only be shining on the lower half of a door stile as the eaves are shading the top. This will cause stress within the component and can present as a bow or twist.

Using engineered components removes most of the internal stress in these cases and reduces bowing to approx 1% of components, compared to approx 10% of solid components.

Switch to Mobile Version