Does any material NOT WARP in Summer heat

[Jeff543]

I've lost faith in UPVC doors and/or windows warping in Summer Heat and or low Winter temperatures.

Is there any material that does not warp?

 

[ronniecabers]

Most upvc will expand and contract with extreme heat variations, specifically the darker colours as they absorb the heat. Upvc doors specifically expand. To reduce the risk of upvc doors warping you should engage the locks everytime you use it. You don't have to actually lock it but engage all the locking points. This reduces the risk of warping as the door sash can not move at the top and bottom ( try it don't engage the locks and push/pull the top or bottom of the door youll be surprised how much it moves). A lot of installers do not tell customers this and manufacturers will ask if you do this

 

[mrrusty]

Yes, doors and windows made in Accoya. They don't move about... at all (technically they do a tiny bit but it is so small you can't notice). Nearly all my doors and windows are Accoya, except our front door which is an off the shelf so called "solid" which I put in cheap and in a hurry. It's lasted 5 years, but is now delaminating despite having been painted really well. Next project - make a front door...

And, yes, uPVC is a rubbish material - it's coefficient of thermal expansion is huge - 0.07 - 0.08 mm/degree/m which gives you about 3mm of expansion/contraction per m over a 40 degree temperature range (easily achieved winter to the sun beating down in summer) In comparison Accoya is 0.014 which gives about 0.6mm over the same temperature range/m