Field Joint On Cement Siding

A common problem with cement board siding products and some other types of horizontal lap siding is that older installation guidelines called for caulking the joint instead of flashing the joint.

Field joint on cement siding.

For pricing and availability. Hardie plank which this siding does not appear to be is the most prominent of the fiber cement siding products but there are other manufacturers as well certainteed etc. Hardiplank lap siding is a fantastic siding material that we ve been using for years on both residential and light commercial building projects. Hardiplank lap siding field butt joint treatment.

Bearskin joint flashing is a plastic sheet for use as a joint flashing behind every butt joint in the siding. This has proven problematic over time as caulking the joint results in unsightly surface appearances due to the different textures as well as resulted in failure of the caulk joint and associated ongoing maintenance. Butt end joints should be installed with factory sealed or factory prefinished ends butted together in moderate contact. In the last few years all manufacturers all that i know of at least have moved to strongly prefer or specifically demand that the field butt joints be flashed not.

James hardie 8 25 in x 144 in hz10 hardieplank cedarmill fiber cement lap siding. The product is a proprietary plastic 20 year uv rated sheet 4 ml thick that is basically a six by twelve post it note. It is never acceptable to leave a gap of any size at a butt end joint. Caulk is usually used with fiber cement siding to prevent water intrusion at the butt joints.

Install the next piece so its end butts lightly against the first photo 7 inset. Gap where the end meets the corner board photo 7 inset and make sure the other end lands on a stud line. Do not caulk fiber cement siding butt joints edges. For pricing and availability.

Each sheet is pre cut with a stick it adhesive for the fastest application available. Fiber cement siding accessories. Measure and cut to length the first piece of siding and nail it in place photo 7. However this detail may not be effective at sealing the ends allowing water to be absorbed and swell the board ends.

Generally the manufacturers do not recommend caulking at factory painted fiber cement siding butt joints presumably because it creates a cosmetic defect. Some instructions permit caulking at primed and smooth siding presumably because the caulk cosmetic defect will be hidden by the finish paint job.