roif insulation

[needadvice]

Hi Very very best, regardless of cost to insulate a skillion roof. Measurements in photos. Is the top timber beam enough for the air gap?  I’ve looked at space blankets that don’t look very well made and thermal- liner & break. Not sure if the break is worth extra for a timber house roof. ?  Also besides this product being stronger does it actually reflect more sun than plain staking?
Also will 90ml batts fit correctly? Thanks (getting a new roof)

 

 

[MitchellMc]

Welcome to the Bunnings Workshop community @needadvice. It's sensational to have you join us, and many thanks for your question about insulating a roof.

Any air gap is better than none at all. Typically, insulation batts offer the best thermal insulation out of the available options, and you'd only not use them if you didn't have the space to fit them. In your 90mm of height, you can easily fit 90mm thick insulation batts, which will generally give you an R2.5 rating.

Please let me know if you have any questions.

Mitchell
 

[needadvice]

Thank you I will.
 Will thermal liner make any difference to stopping the radiant heat more than normal staking? Thanks 

[MitchellMc]

Yes, a thermal liner will typically provide a better break than sarking, @needadvice. Sarking is predominantly used to capture water that has leaked through your roof and divert it to your eaves and out of the roof space. It has very little insulation value.

Mitchell

[needadvice]

Thank you. There is an open veranda, needing a new roof . Would there be any point in using the thermal liner there also? As it’s open on 3 sides. Plus how durable is it if it’s not covered by a ceiling?

also how many rolls of Ametalin 50 m tape for a 80 sq meter house?  Thanks