If the membrane is mated to the substrate without allowing inadequate time of off-gassing, blisters may appear as a result.Įntrapped air/moisture: If the roof deck is damp or has gaps, when the membrane gets hot, moisture vapor/air will expand, causing the overlying membrane to lift, forming a blister.ĭon't recommend that blisters be repaired unless they are damaged. Inadequate flash-off time: Some sealants need time for solvents to off-gas. Blistersīlisters can develop in TPO for several reasons: Seams should be probed with a pick like the one to the left. Even those using electric welding machines can make the mistake of using the wrong temperature settings.
Seams may be improperly welded by those performing hand-welding but lacking skills. The membrane laps must be clean before welding begins or seams may be weak. You should test seams using a pick and comment on weak or failed seams. Seams are heat-welded either by machine (excellent) or by hand (depends on the skill of the applicator). TPO and PVC are very similar in their installation methods and failure modes. Home Inspection Report-Writing Guide PDFįind TPO Manufacturer's website here (scroll to the bottom).Temperature Stratification in Multi-story Homes.Venting High-Efficiency Combustion Appliances Into Masonry Chimneys.Water Heater Backdrafting: Causes and Recognition.
Hardwood Floor Checklist and Diagnostics.Methods for Building with Expansive Soil.Field Guide to Crack Patterns in Buildings.
FLEECE BACKED TPO XSECTION PDF
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