Lazy / Irresponsible Builder / Roofer . Roof shingles are to be replaced. My question is, should I put a layer of OSB (taped at seams) on top of the old roof boards to make it air tight, or can the membrane go directly on the old boards, or do I have to rip off all the old boards to the rafters and then put new sheeting? After the 1960s, the predominant residential roofing substrate became 1/2″ CDX plywood. If you’re thinking of upgrading to a metal roof over an existing part of your home, it’s important to make sure you have a sturdy substructure to support it. Any feedback would be appreciated. 1) Remove the Shingles before Installing the Metal Roof The first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof. The old sheathing boards are likely three-quarters of an inch. When using plywood, nail it directly to the purlins, and screw the metal roofing panels through the plywood into the purlins as instructed by the manufacturer. Well, here is one way to figure it out. When their asphalt shingle roof has reached the end of its life, most people assume their only option is to strip the roof to bare sheathing before a new roof can be applied. While they don't prohibit installation over board sheathing, asphalt shingle manufacturers do specify that the roof deck underneath must be smooth—and tend to recommend plywood as the best option. A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof. It really depends on how big the gaps are anything over an inch I'd want you to resheet it. Beveled wood pieces called "horsefeathers" must be laid along the thick edges of the shakes to make a fairly flat surface. A good substructure will not only act as a base to attach the roof’s fasteners, but also is a vital structural support system. A second question is whether or not it would be reasonable to roof-over this existing surface. Attic ventilation comprises of a poorly installed ridge vent with no soffit vents. I was going to make sure it would end up energy efficient. Some roofers recommend this practice to homeowners who are planning on switching from an asphalt shingle roof. How to install metal roofing over plywood. Secure the plywood by inserting six penny nails along the rafters, spacing them every 6 inches. Recently had hail damage to my asphalt shingles. Other improper installation details? It's common (and acceptable) practice to add a second layer of asphalt or composition shingles over an old roof. But unless the sheathing is extensively damaged or the structure can't support the weight of another layer of roofing, a better solution is to apply a new layer of shingles right over the old one. Hi, I'm planning on re-roofing an older cabin (in zone 5) that has various sized roof boards with gaps under old layers of shingles. June 24, 2020 by McCoy Roofing Staff. My neighbor had an additional 3/8" layer of plywood added. The contractor has asked if it is possible to leave the old sheathing in place, and install the new 5/8-inch sheathing over the top of it. JKW05 (Structural) (OP) 20 May 13 09:29. Wrote about it already BSI-041: Rubble Foundations). With shrinkage of 5-10 percent, gaps of another a half-inch begin appearing all over your roof. OSB and plywood come in thicknesses ranging from 5/16 to 3/4 inch, and the thickness needed for a particular roof depends on several factors, including rafter spacing, expected load and roof … By design, some metal roofs MUST be installed over battens, some MUST NEVER be installed over battens, and some can be installed over battens OR solid decking. If your roof is in good shape but has some damage to one side from a downed tree or has lost shingles in a wind storm, an overlay is worth considering. At my expense of course. A layer of plywood also offers an additional layer of soundproofing from rain landing on the roof, though the air pocket between the roof and the interior drywall plays a larger part in keeping noise down.
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