How to Insulate garage door?

foxhound

Hi, I am looking at insulating my west facing sectional garage door. After reading few different ways on this forum I have decided to use 25mm foil board with 20mm spacers to create an air gap and fit and snug into the rectangular sectional panes on the door

https://www.bunnings.com.au/foilboard-25x2400x1200mm-cathedral25-insulation_p0125959

https://www.bunnings.com.au/foilboard-spacer-blocks-100-pack_p0810886

I would like to know what type of silicon adhesive would be best suited to apply to the spacers to stick to the door which would not damage the door and also easily comeoff without leaving residue if need to. one side of spacers is adhesive which will stick to the foilboard. 

Also, I would like to know what type of saw to use to cut these booards and if my local bunnings store can cut these foilboards to sizes ?

EricL

Hello @foxhound 

I propose using Sika 300ml White NO1 Davco Neutral Cure N Silicone. Because it is neutral cure it does not release acidic byproducts during the curing process, making it non-corrosive and safe for use on sensitive materials. However, it does have adhesive properties in it and will need to be scraped off with scraper if you wish to remove it. 

I'm sorry the store does not provide insulation panel cutting services. To cut Foilboard insulation, use a long, sharp snap-blade utility knife or Stanley knife, marking the line with a pencil first. Apply consistent pressure, potentially requiring multiple passes for thicker boards, then snap the panel cleanly against the scored line. Always wear appropriate personal safety gear, such as gloves and safety glasses, and seal all joints with foil tape to prevent air leaks. 

I also suggest having a look at the GI Building Sciences 10mm 0.5 x 24m 12m² Reflecta Garage Door Insulation as an alternative to the Foilboard 25x2400x1200mm (Cathedral25) Insulation.

A note to our New Zealand readers: The use of foil-based insulation products is prohibited.

If you need further assistance, please let us know.

Eric