Flat Roof Window Buying Guide
At Sterlingbuild, we understand that adding a flat roof extension to your home can add much-needed space to your home as well as value. Choosing the right flat roof window to perfectly complement your extension can be a tough decision.
Our helpful and informative buying guide relieves you of all the stress of having to answer those tricky questions you don’t know the answers for. Such as; what type of flat roof window do I need and what type of glazing do I require?
What flat glass windows are available?
Combining a flat glazed unit with single skin polycarbonate dome; the flat glass domed rooflight have been installed on residential and commercial roofs for years. Suitable for installing on roof pitches between 0° and 15°, the attached polycarbonate dome allows rainwater to easily run off it without the possibility of pooling occurring.
Flat glass rooflights are one of the most popular flat roof windows on the market. Installed on a flat roof with a minimum pitch of 2° stops the possibility of pooling and allows an easy run off for rainwater. Aesthetically modern, flat glass rooflights come in a wide variety of sizes and finishes and offer endless options.
Choose from either a completely flat glazed unit, or VELUX’s ground-breaking curved flat glass rooflight. ECO+ flat glass rooflights can come with built-in LED lights.
Contemporary roof lanterns consist of glazing pieces separated by aluminium trims, which meet in the middle to form a pitch. A traditional roof lantern suits a timber frame building more than the contemporary and comes with more glazing pieces.
Lanterns come in a number of standard sizes and can be also be made bespoke to suit your project. Delivery times on bespoke products are longer than standard products.
Roof lanterns offer a real WOW factor to you home and give the impression of a higher ceiling and a bigger feel to the room.
Walk-on rooflights are ideal for terraced houses or high-density living areas where there is a lack of garden or not enough space to build outwards. Walk-on rooflights offer both daylight to the area below and the support to walk-on the rooflight in case you need to regularly get onto the roof.
Polycarbonate domes come in four thicknesses; single, double, triple or quadruple. They are seen as a low budget flat roof option, ideal for outbuildings and big commercial projects such as schools or places of work.
Polycarbonate is virtually unbreakable and is an ideal replacement for any damaged or discoloured skylight where you don’t want to remove the flat roofing material and the upstand.
How would you like your flat roof window to operate?
Fixed flat roof windows are one of the most popular choices when it comes to deciding if you’d like your window to open or not. Sometimes, no extra ventilation is required as the room the rooflight is going into has plenty of ventilation from other sources, such as PVC windows or bi-fold doors. Fixed flat roof windows are the option for you if you’re working to a tight budget.
Manually controlled flat roof windows offer you the option to ventilate your home - operated by hand or an opening pole. This is the most cost effective way to ventilate your home when compared to the electric version.
Electric flat roof windows can be operated by remote control or wall switch and will add a real WOW factor to your home. Some electric flat roof windows come with rain sensor which automatically closes the window as the slightest detection of rain.
Which glazing finish is best for you?
Clear glazing is the standard finish applied to all flat roof windows and offers an unobstructed view of the sky above. Neutral glazing is not fully clear as the protective coatings on the glass produce a slight tint. Neutral glazing is applied to the ECO+ lanterns as standard.
Privacy glazing gives you exactly that – complete privacy. You’re more than likely going to put a window with privacy glazing in a bathroom or a bedroom. Still letting in ambient daylight, it isn’t possible to see through from either side.
Blue tint glazing removes the harsh glare from the sun and helps protect furniture from the fading effects of sunlight. It also creates a ‘blue sky’ feel whilst also letting in ambient daylight.
The bronze tint is very similar to the blue tint glazing as it also helps reduce glare whilst protecting your furnishings from sunlight.
Which glazing should you go for?
The majority of flat roof windows come double glazed. As standard, the unit is laminated. This stops the glass from dropping if it was to crack or be hit with force and holds it in place until a replacement is available.
Triple glazed flat roof windows offer fantastic thermal performance and energy saving possibilities. They will fit perfectly into a specific energy-saving project where a specific U-value has to be met.
FAKRO triple glazed flat glass rooflights come with a U-value of 0.88 W/m²K.
Quadruple glazed flat roof windows are one of the most energy efficient flat roof windows in the UK market. It would make a fantastic addition to a Passivhaus project or a home looking to be as self-sustainable as possible.
The FAKRO quadruple glazed flat glass rooflights come with a U-value of 0.72 W/m²K.
Are there any extra items I need?
If your flat roof window is going to be up and out of the way, opening rods are available to operate the manual opening flat roof windows and come in a range of sizes. These opening rods make opening your flat roof window easy if it’s installed quite high up.