Installation Manual - CertainTeed

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CertainTeed WeatherBoards Fiber Cement Siding Installation Manual Butt and End Joint Application There are three ways to fasten butt and end joints: 1. Into solid framing 2. Into structural sheathing 3. With an off-stud joiner Butt End/Joints Fastened into Solid Framing or Structural Sheathing Butt end/joints should be installed with factory-sealed or factory-prefinished ends butted together in moderate contact. We recommend that butt end/joints be fastened into a stud or framing member. If no stud or framing member is available, butt end/joints may be fastened into structural-rated sheathing. When installing WeatherBoards lap siding, you must install butt joints using either backflashing, joint covers, or H-covers. Consult local code for butt joint treatment requirements in your area. Backflashing should be constructed of a durable, non-corrosive material that is compatible with fiber cement. Do not attempt to flash behind end or butt joints with housewrap—housewrap will not direct water away from the wall. Flashing size should be a minimum of 6" wide (3" to the left and right of the joint) and extend at least 1" over the top of the previous course. Examples of butt end/joint flashing materials include: X X#15 felt XXTrim coil (painted or PVC coated) XXBear Skin Joint Flashing Joint flashing extends 3" to left and right of joint and overlaps the previous course by 1" Butt End/Joint Application: Fastening to structural sheathing 36 Structural sheathing Overlap flashing 1" Overlap boards 1- 1/4" Nail 1" from board top; nail 1" from butt edge and 3" from butt edge Some flashing manufacturers, including Simplicity Tool and ProTrim, make joint flashing products that do not extend 1" over the top of the siding. They rest on top of the lap. These products are also acceptable. If you choose to use a non-factory end at a butt joint, the side edges must be re-sealed with 100% acrylic latex paint or primer prior to installation. NOTE: Fiber cement siding should be fastened to framing. If no stud is available, place two fasteners 2" apart into structural rated sheathing (7/16" OSB or 1/2" plywood). Fastening to Stud or Framing Member: Place one fastener 1" below the top of the board and no closer than 3/8" from the butt edge into the stud. Fastening to Structural Sheathing: Place one fastener 1" below the top of the board and 1" from the butt edge. Place another fastener 3" from the butt edge. Butt End/Joint Application Studs 16"– 24" o.c. max Joint flashing extends 3" above board and 3" to left and right of joint Overlap flashing 1" Overlap boards 1- 1/4" Fastening to stud or framing member NOTE: It is never acceptable to leave a gap of any size at a butt end/joint. Nail 1" from board top
CertainTeed WeatherBoards Fiber Cement Siding Installation Manual Butt End/Joint Covers Lap siding butt joint covers, or H-covers, may be used for aesthetic purposes and are available in different sizes and designs. If you choose to use a joint cover, use the correct size for the siding that you are installing. Follow the specific joint cover manufacturer’s instructions. Regardless of joint cover design: XXUncoated metal joint covers are not acceptable. XXAll field-cut edges at butt joints must be re-sealed with 100% acrylic latex paint or primer prior to installation. XXFlash butt and end joints with durable, non-corrosive material that is compatible with fiber cement. Flashing (recommended) Weatherresistant barrier H-channel Fasten within 1/2" from top of cover Butt End/Joint Covers Structural sheathing Butt joint cover with wrap- around lower lip hook Do not caulk fiber cement butt joints/edges. Applying caulk to the butt joint is ineffective because the gap is not large enough to accommodate the sealant. Also, on prefinished products, caulk may leave an unsightly looking finish. Spreading or feathering the sealant into a thin film will create a noticeably different appearance, and it can remove the needed thickness required to withstand UV exposure and joint movement. Joints Where Solid Framing or Structural Sheathing Are NOT PRESENT If boards cannot be joined into solid framing or structural sheathing, you must use an off-stud joiner behind the joint. Off-stud joiners are available in different sizes. Choose the joiner that is the correct size for the siding you are installing. 1. Insert the off-stud joiner onto the butt end of the siding. Align the center of the joiner with the end of the siding. 2. Insert the edge of the next panel of siding into the other side of the joiner. 3. Make sure both butt edges of the board are either factory-sealed or sealed after a cut. Then butt the ends of boards together. Non-structural sheathing Off-stud Joiners NOTE: Do not fasten the off-stud joiner to the wall. 37
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Installation Manual - CertainTeed

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