Sealing Masonite Siding Butt Joints

Old 07-30-07, 03:43 PM
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Smile Sealing Masonite Siding Butt Joints

I am preparing the exterior of my house for painting. It is a 30 year-old house with 12" masonite lap siding and many of the butt joints have separated, leaving a 1/16 inch gap. I have tried caulking some of these joints with acrylic latex cault w/silicone, however this is not working. How can I properly seal these but joints? Need an answer fast, as I am spraying in 4 days!
Old 07-31-07, 06:25 AM
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Welcome to the diy forums!

Caulking is about all you can do. Masonite siding is supposed to have a metal/plastic connector between pieces. This allows the siding to expand/contract without leaving a gap. Most builders didn't use them and they do look ugly IMHO.

Be sure to use an oil primer any where the masonite might be starting to deteriate - I'm sure you already know how moisture sensitive your siding is.

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