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The existing three tab shingle roof is threadbare and water is coming in a few places. The owner doesn’t want the expense of reshingling at this time. Can he spray a thick coat of elastomeric paint on the shingles as a temporary fix?
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That's one I never heard off. Plugging the holes with gum might hold for awhile. But seriously, IMO nothing is more important than a good roof. Do it right. If the owner doesn't have the money, a home equity loan is in order.
*Speaking as one who's used synthetic stucco (which is really an elastomeric paint with aggregate) on the exterior......no. Ours works fine because the outside is a smooth, monolithic surface. But the elastomerics I know of have about a 33% "stretch" and that's not a whole lot when you're talking about a shingle roof that will expand, contract. I think you'd see the cracks in the paint real fast, and they would serve to channel the rain runoff *under* the paint and keep it there. Thickness won't help. It's not cheap, either.If he's committed to a coating, look at Recycled Rubber Roofing, from Specification Chemical in Iowa. It's a water-based liquid that can be sprayed or rolled. I am not saying and will not say it is or isn't appropriate for this situation (is that a sufficient disclaimer?), but I've used it on a flat roof and am VERY happy with it's performance. Two years and no wear, no tear, no degradation. At least worth looking at.
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The existing three tab shingle roof is threadbare and water is coming in a few places. The owner doesn't want the expense of reshingling at this time. Can he spray a thick coat of elastomeric paint on the shingles as a temporary fix?