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Underlayment - 30 lb Felt or peel and seal

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Guest User
10/23/2004
I am a builder in the South Texas area. I have used 30lb felt as underlayment for metal roofing for many years...my supplier is now promoting a "peel and seal" underlayment similar to the ice and snow shield used up north...I was concerned that the heat of south texas would cause the metal roofing material to stick to the underlayment...which is the best to use?
Guest User
10/23/2004
Your concern is valid and it depends upon the top surface of this material. Some of these materials are "HT" -- High Temperature meaning that oils will not leech through them and stick to the roofing. Additionally, not all self-adhering products are suggesting for entire roof jobs -- some are still intended for use over the roof perimeters. One more thing -- self-adhering underlayments really do not breathe so do not forget about proper attic ventilation if you use these products. Also, there are new synthetic underlayments which are polymer-based and hence more durable than felt but which are not self-adhering. Finally, whatever underlayment you use, make sure it is acceptable with your metal roofing manufacturer.
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