Minimum Required Psi Foam Board For Roof

2009 international building code 23 chapter 3 roof system.

Minimum required psi foam board for roof.

In fact the 20 2 psi value is beyond the elastic range of the eps material and long term creep effects must be taken into account when using that design approach. Cover boards refl ective membrane surfaces or pavers may. 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. In roofing type i eps material provides the dimensional stability and compressive strength necessary to withstand light roof traffic and equipment weight at reasonably high surface temperatures.

Maximum dimensional stability limit of 2 percent vs. The panels need to fit together tightly to help prevent warm air from leaving the top of the building. Such as 15 pounds per square inch psi 25 psi or 40 psi. This section outlines the conditions for unvented attic roof assemblies.

Greenguard type vi 40 psi insulation board is designed for use in high load applications requiring compressive strength up to 40 psi. Available in 0 5 thick 4ft x 8ft 1220mm x 2440mm and 0 5 thick 4ft x 4ft 1220mm x 1220mm panels. Guidelines for complying with building code requirements for roof assemblies. Note that table r806 4 indicates the amount of insulation above the roof deck or air impermeable insulation below the roof deck required for condensation control assuming minimum required total insulation as indicated in section n1102 building thermal envelope.

Meets the requirements of astm c 1325. Rigid foam is produced in various size panels 4 ft x 8 ft 4ft x 4ft etc. Plus it s light weight easy to handle and easy to cut with a knife. P 8000 pounds h 6 inches f c 2 500 psi e 57 000 2 500 2 850 000 psi u 0 15 k 360 psi for 1 inch eps.

Eps foam insulation may experience dimensional and property changes when it is exposed to temperatures greater than 167 f. Minimum roof slope required for. K 360 psi 2 inches 180 pci. With an r value of 5 0 per inch of thickness the board increases the energy efficiency of your structures.

Composed of a lightweight cementicious core to provide exceptional impact resistance. Extruded polystyrene closed cell foam astm c578 type iv 25 psi minimum shipped in poly wrapped units with individually wrapped or banded bundles. Grading the isocyanurate by compressive strength grade 1 compressive strength is minimum 16 psi grade 2 is minimum 20 psi and grade 3 is minimum 25 psi. The existing standard of 4 percent which would allow a 96 inch board to expand contract 3 13 16inches.

Manufactured in accordance with astm c1289 type ii class 4 grade 1 80 psi 551 kpa minimum up to 110 psi 758 kpa compressive strength. After the roof deck is prepared the rigid foam boards need to be cut to size to fit snugly together on your roof.