Gaps Between Hardi Plank Siding

4 42 dissimilar materials.

Gaps between hardi plank siding.

1 8 gap between siding and trim surrounding windows and doors always if trim boards. Run the siding to the hardietrim board leaving a 1 8 in. 1 8 there should be a gap between dissimilar materials. Joining hardie boards together is actually very easy but there are a number of ways that contractors get it wrong.

Fiber cement should be separated from other materials such as brick stone wood and metal. Hardie boards should be joined in moderate contact. When james hardie siding products butt into wood based materials a 1 8 gap will allow for expansion and contraction of the wood based product. Flashing installed incorrectly or siding installed without the proper gap between the siding and flashing will both result in water damage and a voided warranty.

James hardie s seal of approval indicates products recommended for use by james hardie building products circular saw with dust collector circular saw blade with carbide tipped teeth framing requirements. Or directly to minimum 7 16 thick. Joint flashing butt joint horizontal lap treatment june 2014 james hardie does not. James hardie recommends the use of caulks and sealants that remain permanently flexible.

Remember that most hardie siding problems are caused by improper installation. Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24 o c. James hardie recommends the use of caulks and sealants that remain permanently flexible. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

Look for the words permanent flexibility or permanently flexible written on the label. When james hardie siding products butt into wood based materials a 1 8 gap will allow for expansion and contraction of the wood based product. When installing the first course make. The bottom of the siding should be kept even with the bottom of the trim or if desired the trim may extend below the bottom of the siding.

But the siding should never hang below the trim. Gap between the siding and trim. Look for the words permanent flexibility or permanently flexible written on the label. This is a common mistake and so easy to avid.

James hardie siding is 12 feet long which means that siding on your longer walls will need to join together.