Gaps Between Hardi Plank Siding

Gap between the siding and trim.

Gaps between hardi plank siding.

Look for the words permanent flexibility or permanently flexible written on the label. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. 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. This is a common mistake and so easy to avid.

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. 4 42 dissimilar materials. Joining hardie boards together is actually very easy but there are a number of ways that contractors get it wrong. 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.

James hardie siding is 12 feet long which means that siding on your longer walls will need to join together. 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. But the siding should never hang below the trim. James hardie does not recommend using caulk or h jointers for the butt joints of hardieplank siding with colorplus technology.

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. James hardie recommends the use of caulks and sealants that remain permanently flexible. James hardie recommends the use of caulks and sealants that remain permanently flexible. 1 8 gap between siding and trim surrounding windows and doors always if trim boards.

1 8 there should be a gap between dissimilar materials. Fiber cement should be separated from other materials such as brick stone wood and metal. 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. Joint flashing butt joint horizontal lap treatment june 2014 james hardie does not.

Remember that most hardie siding problems are caused by improper installation. Hardie boards should be joined in moderate contact. Look for the words permanent flexibility or permanently flexible written on the label. Or directly to minimum 7 16 thick.

When installing the first course make.