Just install the 2 inches of closed cell spray foam on the underside of the roof sheathing followed by about r 36 of fluffy insulation on the underside of the cured spray foam and stop worrying.
How to secure iso board under tpo roof.
Insert a plate every 2 square feet of insulation board.
Tpo insulation and cover boards learn about tpo insulation and cover boards.
Isoboard can be installed directly below the existing ceiling as a retrofit.
Cover boards are strongly recommended on roofs where regular foot traffic or maintenance work will.
In this case if there s only one roofing system in place is to install a cover board over the tpo roof cut the flashings off and then install a spray foam roofing system.
Since this polyiso is as thin as 1 4 inch in certain areas it s best to ignore it.
Composed of a lightweight cementicious core to provide exceptional impact resistance.
Use a drill to drive.
A cover board is typically a gypsum board that is installed directly under the membrane.
Meets the requirements of astm c 1325.
5 tips for installing isoboard thermal insulation as a ceiling.
Cover boards provide a more solid backing than the insulation boards alone which improves the puncture resistance and long term durability of the roof.
Exceptionally high compressive strength improves overall roof system performance cement board is able to withstand prolonged exposure to moisture and is ideal for systems where wind uplift and puncture resistance are a concern.
This will save you money from completely tearing off the existing roof and installing a new tpo system.
Position the fastening plates over the insulation board.