Gaps Between Hardi Plank Siding

When installing the first course make.

Gaps between hardi plank siding.

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. 1 8 gap between siding and trim surrounding windows and doors always if trim boards. Look for the words permanent flexibility or permanently flexible written on the label. Joining hardie boards together is actually very easy but there are a number of ways that contractors get it wrong.

James hardie recommends the use of caulks and sealants that remain permanently flexible. But the siding should never hang below the trim. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. James hardie does not recommend using caulk or h jointers for the butt joints of hardieplank siding with colorplus technology.

4 42 dissimilar materials. 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. 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. Fiber cement should be separated from other materials such as brick stone wood and metal.

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. This is a common mistake and so easy to avid. Or directly to minimum 7 16 thick. Hardie boards should be joined in moderate contact.

James hardie recommends the use of caulks and sealants that remain permanently flexible. James hardie siding is 12 feet long which means that siding on your longer walls will need to join together. Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24 o c. Gap between the siding and trim.

Joint flashing butt joint horizontal lap treatment june 2014 james hardie does not. Run the siding to the hardietrim board leaving a 1 8 in. Remember that most hardie siding problems are caused by improper installation. This technical bulletin is an explanation supporting the announcement made by james hardie on september 8th 2008 withdrawing its recommendation on the use of caulk at field butt joints for hardieplank lap siding.

1 8 there should be a gap between dissimilar materials.