Garage roof material choices.

[MisterG81]

Looking to have an old small concrete sectional garage ripped down and replaced with a bigger one.

For the new one, there’s a couple of choices of roofing material, eg plastisol coated steel with dripstop lining (for a pent design), or cement fibre sheets for an apex design.

as far as roofing materials go, is one better than the other? - insulation/condensation etc.

ultimately the garage will have a car in it, and space at the back as a bit of a utility/work area.. and will possibly look at insulation at a later date if necessary.

 

[oldbutnotdead]

Cement fibre sheets? Are those corrugated or flat?
The cement sheets will perform better as insulators than the tin sheet. You can get tin sheets with PIR insulation fixed to them relatively cheaply, might be worth a look cos they'll perform much better.

 

[MisterG81]

Cement fibre sheets? Are those corrugated or flat?
The cement sheets will perform better as insulators than the tin sheet. You can get tin sheets with PIR insulation fixed to them relatively cheaply, might be worth a look cos they'll perform much better.

They will likely be corrugated onduline or similar.
The company can supply 40mm insulated metal sheets as part of the build but it’s silly expensive (£9 per sq ft!) - so probably more effective to insulate with PIR after it’s built.

 

[oldbutnotdead]

That's a bit steep, have a look online for supply only, every so often a batch of 100mm insulated tin sheets will pop up (surplus from warehouse builds I think). Advantage with the pre-insulated is you don't have to leave a ventilation gap between sheets and insulation

 

[Harry Bloomfield]

Metal sheets are much more robust.

 

[Old Salt]

I have a wooden garage with onduline sheets, you need exterior grade ply under the onduline as it can get floppy in the summer. The ply helps give rigidity.

 

[Harry Bloomfield]

I have a wooden garage with onduline sheets, you need exterior grade ply under the onduline as it can get floppy in the summer. The ply helps give rigidity.

No such problems with the metal, though if it needs to be stood upon, the thicker version is better.