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Black Window Frames: Laminate vs. Paint vs. Fibreglass, Black Outside and White Inside, the Heat Problem on South Walls, and What the Colour Warranty Really Says
Windows & Doors
Black Windows: They Look Right on Everything, and They Are Harder on the Frame Than Any Other Decision You Will Make
Half the new houses I see now have black windows and most of them look better for it. The frame does not care how it looks; it cares that a black surface in July sun runs 30 degrees hotter than a white one, every day, for thirty years. Vinyl notices. Here is how black is done well, how it is done badly, and the one line in the warranty that tells you which you are getting.
The numbers
+8%black exterior on vinyl, typical
65 to 75 Csurface temperature of a black south-facing frame in July
10 to 20years on a good colour warranty; read it
+$0for black on most fibreglass series
Three ways a vinyl frame gets to be black
- Laminate (foil). A thick acrylic or PVC film bonded to the white extrusion. The good ones carry solar-reflective pigments that bounce infrared even though the colour is black, which keeps the frame 10 to 15 degrees cooler than a plain black would be. Warranted 10 to 20 years against fade and peel. This is what the good Ontario makers do.
- Paint. A sprayed coating on white vinyl. Cheaper, thinner, more likely to chalk and scratch, and the frame underneath gets the full heat. Some makers do it well with a baked finish; ask what it is and what the warranty says.
- Through-colour or co-extruded. The outer skin of the extrusion is black material itself, so a scratch is still black. Rarer, used on some premium series and on composite frames. The heat problem remains unless the compound is formulated for it.
Fibreglass is painted at the factory with an automotive-grade finish and does not expand with the heat, so black is close to free and the warranty is usually the same as white. This is the single best argument for fibreglass on the sunny side of a house.
What the heat does to vinyl
Vinyl softens as it warms and expands roughly seven times as much as glass. A white frame on a hot day reaches 40 C; a black one, 65 to 75. The frame grows, the glass does not, and the sealed unit gets pushed against its stops; the corner welds take the strain. Repeat for thirty summers. On a small north window nobody will ever know. On a 60 by 72 picture window facing south, a poor black vinyl frame can bow, crack a corner, or pop the sealed unit’s seal in ten years. The good makers handle it with reflective laminates, reinforced sashes and a stiffer extrusion; the builder-grade series do not, and they are the stories you hear.
The practical rule: black vinyl is fine on north and east, and on small openings anywhere, from a maker with a reflective laminate and a written colour warranty. For the big south and west units, fibreglass or a composite frame, or stay white and paint the trim.
Black outside, white inside, or black both?
Black outside and white inside is the standard order and the cheaper one: the laminate is on the exterior face only, the interior is the white extrusion, and the trim and drywall returns are white. It suits most interiors. Black both sides is a second laminate, more money, and it commits the rooms to black trim or a contrast that has to be designed. On a modern house with dark floors and big glass it looks right; on a 1990s house with oak trim it looks like a mistake. Decide with the interior in the room, not from the brochure.
The colour warranty, line by line
- Term: 10 years is ordinary; 20 is good. Lifetime on the frame does not include the colour; look for the colour line.
- What is covered: peeling and delamination usually; fade only beyond a stated amount, measured on a scale you will never see. Chalking is often excluded.
- Prorated: many colour warranties pay 100% for a few years and then a declining share. Ask for the schedule.
- Labour: almost never. A replacement sash is shipped; somebody has to fit it.
- Exclusions: south-facing installations in some warranties, which is the one to find before you buy black for the south wall.
The warranties page covers the rest of the document.
Where homeowners go wrong
- Black builder-grade vinyl on the south side. The one combination the material cannot take.
- Not asking whether it is laminate or paint. Same word on the quote, different window.
- Black inside without thinking about the trim. Black casing, black returns, or a white-black joint that needs a designer.
- Mixing makers. Two companies’ blacks are two blacks. One maker for the whole elevation.
Questions people ask
Do black vinyl windows warp?
Cheap ones on sunny walls can bow and crack at the corners over years. Good laminated series with reflective pigments, reinforced sashes and a stiff extrusion hold up. Fibreglass does not have the problem at all.
Do black windows fade?
Good laminates hold colour for 20 years and more; paint chalks sooner. The warranty term is the maker’s own estimate of how long theirs lasts.
Are black windows hotter inside?
No; the colour is on the outside face and the glass does not change. The frame surface is hotter outside, which is the frame’s problem, not yours.
Price the colour
The calculator carries black exterior as its own line on vinyl, and fibreglass as the frame that does not charge for it. Run it both ways for the south side.
Sources and further reading
- Nordik Windows and Doors: an Ontario maker; their series pages show what a frame spec and a certified rating look like.
- ENERGY STAR Canada technical specification for windows, doors and skylights: Natural Resources Canada. The U-factor and Energy Rating thresholds, and the certified product lists.
