Why We Re-Sheet Over Skip-Sheathing
Cedar shakes have always been a popular roofing material, and in our area, it was the choice material the 1980’s and 90’s. Since then the composition shingle has taken off as the main material used. We at Chase Construction NW, Inc. are now looking at the end of life for many Cedar Shake roofs and have been busy converting them to more modern roofing applications.
What is Skip-Sheathing?
Skip-sheeting or spaced sheathing, consists of 1-by-4-inch boards nailed to the rafters with gaps between the boards. This is traditionally used as the sub-straight for wood shakes. The spaces between the boards allow the wood shakes to breathe so that they dry more uniformly after being soaked in the rain, limiting warping. This does not apply in environments with wind driven rain and snow however. When installed correctly, wood shingles are rigid and allow the roof to be walked on. However, composition roofing, and some modern wood shakes need to be installed on a solid deck, not only for stability to walk on, but to prevent water penetration. Modern materials and underlayments are breathable and have no need for spaces in the decking.
What Material Can I Use to Resheet the Deck?
Some have said that you can put slats of new wood between the existing skip-sheathing to create a solid deck, but that creates a multitude of unforeseen problems. Depending on how old the skip-sheathing is and how many layers have already been applied to it, it has seen many nails, which means it will be riddled with holes, and will not make a good surface to nail new shingles down onto. Also, when you put new wood between old wood, in time gaps will open up between the boards. When nailing down the shingles on a system like this, the nails have less of a chance to hit a solid surface, lowering the shingle’s wind resistance. For these reasons, solid sheets should be applied on top of the skip-sheathing to create a solid sub-straight for the roofing system. New roof sheeting should be either 1/2″ CDX plywood or 7/16″ OSB (oriented strand board). Both are readily available and come in 4×8 foot sheets. 3-inch nails should be used during application to ensure that it connects the new sheeting, skip-sheathing, and rafters together for a reliable hold.
Let Us Help!
Many handy homeowners have taken on their own roofing projects, some with great results! But some have had devastating results because they lacked the details that are crucial to a long lasting, leak free roof. We at Chase Construction NW, Inc. work hard to stay educated and trained on new trends and developments in the industry. Our crew is knowledgeable, experienced, and professional! We are licensed, bonded, insured and have been roofing right here in the Puget Sound for over 15 years! You can trust that you are getting a quality, long lasting roofing system! So if you have a Cedar Shake roof that is at the end of it’s life, or any other material, let us help! Contact us today for your free, no obligation estimate! Fill out our free estimate form or call us today at 253-445-8950. Thank you for considering us for your next project!