Roofing Over Skip Sheathing

Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing.

Roofing over skip sheathing.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. Also note that a new fully adhered membrane is installed on the original roof deck replacing the one installed 17 years ago is folded down to catch the top edge of the wall water control layer. Most cedar shake roofs were installed over skip sheathing a poor substrate for asphalt composition shingles. Wood shingle and shake roofing is best applied over open sheathing because the spacing between the open sheathing allows.

Over roof insulation the gable overhang has been cut flush with the wall sheathing. This provides added protection against ice dams. Once this roofing material started to wear out composition shingles began being applied over the original sheathing. Until the 1940s exterior grade plywood was not available.

Open sheathing also called skip sheathing is composed of boards spaced apart. This type of roof sheathing is used under wood shingles and shakes which usually require ventilation on both sides of the roofing material. Roof decks on homes built before 1970 are often 1 8 fir pre plywood shiplap. By code you cannot have three layers on a roof.

Apa rated sheathing panels which include plywood and oriented strand board may be used for this purpose. When the panels are attached over the. Osb or plywood over skip sheathing makes for a much stiffer roof deck resists problems with expansion better and obviously doesn t require all the hassle of removing it. After you strip the roof do spot repairs to the existing sheathing where needed then go right over it.

Skip sheathing for cedar shingle shake roofs used to be very common in this area of the country and we never remove it or seen anybody else remove it for that matter. You ll want to use both longer sheathing nails and longer roofing. Was your roof originally built with shiplap. As more and more layers of the roofing kept being added there was a minimal chance that any water was going to be able to work its way through your roofing deck.

Osb or 1 2 plywood over skip sheathing makes for a much stiffer roof deck resists problems with expansion better and obviously doesn t require all the hassle of removing it.