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What goes under slates on a roof?

Updated: 9/20/2023
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12y ago

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The best thing that should be under a roofing slate is all natural, hard, solid wood. when a slate roof is installed properly NO UNDERLAYMENT IS NECESSARY. however roofing felt is often used to waterproof the building during installation but is not a necessary component of a slate roof. there is not an underlayment in existence that will last even half the life of a properly installed natural slate roof. underlayments are not just a waste of money, many of them can actually decrease the strength and longevity of your slate roof. most roofers install underlayments under their slate roofs as a "back up plan" because they don't trust their workmanship. sticking to using only time tested materials and techniques is the best way to install anything and avoid taking unnecessary, unproven risks. 30# roofing felt is the best product to use under slate because it is thick enough to protect the building during installation and it still allows the roof to breathe. also never install a slate roof on a plywood deck. best case scenario would be raw, sawn, hard lumber at least 1" thick with at least 1" horizontal gaps between boards. i prefer a fresh or "green" oak or hickory installed "green" so it is still soft enough to accept slate nails but will soon after harden and give the best hold on the nail shanks. I've re-sheeted too many roofs to be ignorant enough to think plywood will hold nails securely for at least a hundred years. also in most places you can go directly to a saw mill and get ruff sawn lumber for about the same price as plywood. make sure you use good fasteners and hand nail yes the deck too.

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Q: What goes under slates on a roof?
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Where can one purchase roof slates?

One can purchase roof slates on various websites like Amazon or eBay. One could also go to a local furniture store and ask if they have any roof slates for sale.


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