Caulking Cement 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.

Caulking cement siding.

Also avoid caulking tongue and groove siding boards together. Well i ve got cement board siding and occasionally a crack appears. Good for gutters siding and concrete. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.

Item 157140 model 11532. Fiber cement siding gap clearance caulking specifications. It s available in many styles and widths both smooth and wood textured and you still get the crisp joints and details that ll make your home s exterior stand out. Siding nails should not be caulked another item that needs room to play is siding boards themselves.

Is there anything out there you could help me with to repairs cement board siding. Dap alex plus 12 pack 10 1 oz white paintable latex caulk. The best exterior caulk for roofing construction and repairs since it can withstand extreme temperatures and creates a strong insulating and water tight seal. Many professionals like those at james hardie also agree that you should not use caulk on fiber cement siding unless there is no metal flashing underneath.

The nails holding up the siding should not be caulked. Fiberglass cement siding is a composite made of portland cement silica and wood fiber. Metal flashing or any metal to wood joint should not be caulked another water exit pathway that should never be sealed. And it just kind of swells and shrinks with the weather and it shows after you paint it.

The following information is adapted expanded a bit from certainteed corporations installation instructions for the company s fiber cement siding products as this is the most comprehensive guide we could find for caulking clearance instructions when installing fiber cement siding. Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job. And i m wondering i ve tried a couple different caulks.