How rigid insulaton is attached to roofs?

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Old 04-04-20, 01:22 PM
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How rigid insulaton is attached to roofs?

I'm thinking of applying some rigid insulation on top of my existing tar and white rock pebble roof. The roof has a very slight pitch. It's open beam with tongue and groove 2 X 6's below. I just want to cover the area of an Airbnb guest room (about 15' X 15') where the heat just escapes right out of there.

How is rigid insulation attached to roofs? Do you need a 2 X 2 piece of wood to keep the insulation from sliding down? And then screws with washers to hold the insulation in place?

And is it doable for me as a do-it-yourselfer to rent out a heater to melt the tar and apply it myself?
 
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Old 04-04-20, 04:59 PM
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You can use screws and plastic tabs. After the insulation is down you would generally cover it with another layer to protect the insulation and that is mold resistant. There are many products that are used. Densdeck is one popular one. The jobs I have been on, the Densdeck is adhered with a foam adhesive... No fasteners.

I'm not up on hot mop roofs so maybe someone else will answer that part for you.
 
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Old 04-04-20, 05:16 PM
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By "cover it with another layer" do you mean a second layer of insulation?
 
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Old 04-04-20, 05:22 PM
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The sentences that follow mention Densdeck and other similar products.
 
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