Prepping Siding for Paint

copyright 2000 G.G. Alonzy

Dear NH,
Do you caulk all of the joints between the vertical boards of vertical board siding when prepping to paint a house? Or is it like horizontal clapboards, which are left uncaulked at the laps, to allow moisture to escape?

First, a disclaimer. I am no fan of vertical siding since it just does not do a great job preventing water from seeping into the wall as does horizontal, overlapping siding. I have seen too much wood rot encouraged by this visually attractive but functionally deficient siding. I don't have a place in my big heart for it!

In my opinion, caulking between the seams in any lapped siding (either horizontal or vertical) is not good practice but not just because of any potential vapor barrier effect. The siding expands and contracts with temperature and humidity. Think of a wood home as a living thing. It needs to move and breathe. When you try to restrict either it is at your peril!

Caulk, by its adhesive nature, will try to limit this movement, leading to widespread failure and cracking in the caulk over time. This will in turn be unsightly and not amenable to easy repair, adding to the prep workload when repainting. This is not to imply that caulk has no place in paint prep! Places where dissimilar materials meet and around window and door frames are two examples of areas needing proper caulking.

The other issue is the sheer volume of the caulk that would be needed to accomplish this job. And, barring the rental or purchase of bulk caulk and air compressor-powered caulking equipment, the time and energy needed to do such a job would also be prohibitive.

If the home has been properly constructed, and there is a housewrap of some kind under the siding to prevent exterior moisture from reaching the framing, you should not have a need to even consider any further weatherproofing outside other than a quality paint or stain job.

Have a small home repair question for THE NATURAL HANDYMAN? Just click here For more home repair information, visit NH's growing list of original home repair articles and quality links If this information has been valuable to you, please consider making a small donation to support NH's free service to the home repair community! For more information, please visit our "Friends" page

The Natural Handyman Site Directory

Stay Connected with TDS

Little Luxuries

to the Dollar Stretcher newsletter and get a copy
of our ebook
Little Luxuries:
130 Ways to Live Better...For Less
for FREE!

Your Email:

View the TDS Privacy Policy.

Get Out of Debt