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Architect specs Post New Topic | Post Reply
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travis fails
Posted: May 04, 2008 12:50 PM
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Architect specs
Can you tell me what this architect is calling for? The spec calls for ASTM C 1029-Standard Specification for Spray- Applied Rigid Cellular POlyurethane Thermal Insulation; 2005a.The prints do not state an r-value. It is calling for 5 1/2 ins. in the walls and roof. |
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mason
Posted: May 04, 2008 12:59 PM
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ASTM C 1029 is the standard specification for spray applied cellular polyurethane foam. It classifies SPF into 4 types according to minimum compressive strength Type 1: 15 psi min, Type II: 25 - 39 psi Type III: 40 - 59 psi Type IV: 60 psi min C 1029 also lists properties for each type such as R value: (6.2 min for all types), response to humid aging (dimensional stability, water absorption, tensile strength, closed cell content (90% min) and permeability (resistance to water vapor, 3.0 min) In short the spec is calling for a closed cell SPF with a non-water blowing agent such as a HFC 245 blend. Check you material supplier's data sheet and download ASTM C 1029 at astm.org (costs around $25) |
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travis fails
Posted: May 04, 2008 01:49 PM
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What I thought just making sure going to call him Monday The builder said he thought they wanted open cell. Thanks |
