Roller doors are not sectional doors
I fitted 40mm sectional electric doors aftre the old henderson fell to pieces. I got condensation on the outside of the panels to within 1 inch of both the joins and edges this winter and 10deg inside from house leakage.
You can get insulated roller shutter doors – they need loads of headroom for the roll and given each panel is only 2inches wide you have lots of gaskets to leak instead of 4 and lots of noise to operate.
One thing to consider is if this is the only access to the garage you need a lockable manual release in case of power cuts or or blown fuses. Else you'll be removing roof tiles to break in. Very few suppliers seem to bother with this.
Mine has a yale type key for manual that does not look like a handle.
i fitted mine during a full day with only a bit of help from the lad to lift the panels
Edited By Dave Halford on 17/08/2015 12:21:01