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Question DetailsAsked on 9/9/2013

Which roofing procedure lasts longer, hot mop or peel and stick ?

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2 Answers




Do it right and never have to do it again for a LONG TIME!

Answered 7 years ago by Onlythebestbuilder


As other comment says:

Hot mop takes a lesser level of skill to apply or repair, but generally has the shortest life (physical wind blown debris or surface abrasion damage aside). Hot mop also does not tend to have catastrophic initial leaks as often - usually, they start as small leaks that can be detected by thermal IR camera early on. The plastic/fabric membranes tend to fail at seams as a rule, so you can get a substantial leak at the start.

Peel and stick, done right and barring being peeled back off by extreme winds probably next. Ditto for mechanical fastener membrane roofing, through it is prone to more small leaks at the fastener penetrations. Both have seam problems commonly.

Then TPO and EPDM and PVC/CPA (types of plastic membrane) can be significantly longer lived IF properly done and properly selected for your temperature regime (veary hot or cold requires different product), but also takes greatest level of expertise to apply.

Longest lived probably thick-membrane IRMA roofing using EPDM or HDPE liner - but requires high level of skill to do without holes, needs heating to do the folds at corners, and unless the roof is designed as a slightly sloped or domed "skullcap" design where the membrane covers the entire roof and wraps over the edges in one piece, requires cover pavers to hold it down againsat wind uplift. Normally used on commercial flat/very low slope roofs because the pavers increase design load above normal residential roof design. Low-slope roofs with metal roofing fall in the same lifespan category, though if they do not use full-length panels the joints can be a problem with leaks.

Off the cuff, typical range of roof lives (not counting repairs if physically pierced) - maybe 8-20 for built-up tar and felt (hot mop), 10-20 for peel and stick, 12-25 or even up to 30 for TPO/EPDM/UV protected PVC like Hypalon, 30-50+ for HDPE. The longevity depends largely on whether it is walked on (bad) or equipment is installed through it (worse if avoidable), and on the seam integrity so seamless (one-piece) is FAR to be preferred if the roof is small enough.

One thing to note - TPO has had a lot of bad history in its formulation, with plastic disintegration and cracking and tearing - in generation III now and still having problems, so for my money I would stay away from TPO and use EPDM or modified PVC instead if looking in that price range.

Here are a slightly technical articles of various roofing types (there are over 40 various types of materials) and some lifetime info:

Answered 5 years ago by LCD

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