Roofing Over Skip Sheathing

After you strip the roof do spot repairs to the existing sheathing where needed then go right over it.

Roofing over skip sheathing.

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. 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. You ll want to use both longer sheathing nails and longer roofing. This type of roof sheathing is used under wood shingles and shakes which usually require ventilation on both sides of the roofing material.

If you re replacing your cedar shakes roof check out our discussion of re sheeting over skip sheathing. Apa rated sheathing panels which include plywood and oriented strand board may be used for this purpose. Over spaced board roofs number p300c january 2006 when replacing roofing it is often necessary to cover spaced boards with a solid roof deck. Most cedar shake roofs were installed over skip sheathing a poor substrate for asphalt composition shingles.

By code you cannot have three layers on a roof. 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. Open sheathing also called skip sheathing is composed of boards spaced apart. Over roof insulation the gable overhang has been cut flush with the wall sheathing.

Until the 1940s exterior grade plywood was not available. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. 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. Once this roofing material started to wear out composition shingles began being applied over the original sheathing.

Wood shingle and shake roofing is best applied over open sheathing because the spacing between the open sheathing allows. Was your roof originally built with shiplap. Roof decks on homes built before 1970 are often 1 8 fir pre plywood shiplap. 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.

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.