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You are here: Home / Articles / Termites (Part 3) Termite Resistant Construction

October 24, 2013 By Brandon D'Rion

Termites (Part 3) Termite Resistant Construction

Deck- side area.

Termite Prevention and Construction

Excellent termite summaries are available from UC Davis Statewide Integrated Pest Management (links at end of this article).

Fighting off Subterranean (under ground) Termites:

You should probably have a termite inspection periodically. Someone should crawl the whole crawl space looking at the foundations for evidence of subterranean (under ground) termites. They make mud tubes from the soil over concrete to the wood. And look for damp or wet areas of ground under the house. This is more important if you live where the ground is usually damp, or you water a lot, or your neighbors have subterranean termites. The rest of the techniques in this post will help where applicable.

Replacing damaged wood plus removing and/or preventing the moisture they need are effective.  These may be labor intensive.  Handling moisture means 1) fixing any leaks or re-directing rain or other water 2) drying out the ground under and near the building. This may or may not be practical. 

If you have subterranean termites the standard treatments involve injecting chemicals into the soil, and rechecking later. I am not an expert, but it looks like treatments containing imidacloprid or fipronil are the most effective with the lowest toxicity to humans. (Although these have been suspected in bee colony collapse disorder, their use underground is probably not going to affect bees. This is not the same use as spraying of crops.)

Fighting off Drywood Termites:

Most important principle: prevent water from getting and/or sitting between boards.

If remodeling or building, follow building codes about heights of wood above the soil.  UC Davis recommends 12 inches minimum.

Many of these recommendations also help discourage subterranean termites.

Per building codes, the bottom boards of wall or floor framing that lie on concrete must be “Treated” lumber – treated with chemical preservatives to help protect the wood from attack by termites, other insects, and fungal decay. Also any cut ends should get wood preservative, twice. Supplies are wood preservative, rubber gloves (it is poison), a can and a brush.

Prevent water from infiltrating into the walls. There are a lot of codes aimed at this. Understand what you are doing and why, when building or repairing. And don’t let a roof keep leaking.

Fix plumbing leaks promptly, especially drain pipe leaks, which tend to be hidden.

All exterior wood should be painted or sealed occasionally. Even one coat of paint will discourage a surprising variety of insects. This includes, for example, carpenter bees. Paint is not highly effective against termites but it helps.

Making a Wood Deck Last Long:

The deck joists are a lot harder to replace than the deck boards you walk on.  The joists are the boards placed “on edge” holding up the deck surface.

The nail or screw holding down a deck board makes a path into the body of the joist. Over time this will allow water into the joist. If you put self-adhesive rubber roofing membrane on the joists, and then screw (or nail) your boards down, this will seal around the nail or screw. Cut rubber strips with a straight edge and utility knife a little wider than the joists, say 1-3/4” wide. The strips can be stapled down with a construction stapler.  This helps keep water out of the path the nail or screw makes into the body of the joist. It also separates the joist from the deck board. This reduces water being trapped on the top of the joist, as well as inside it. The bottoms of the deck boards can be treated with clear wood preservative. It will help if the joists are treated and they can be painted as well, all before the deck boards are installed.  It is almost impossible to keep water out of the joist to deck board contact areas after installation.  You cannot caulk the joists between the deck boards for example. All this work prevents water from repeatedly soaking into the joists.

Another option may be to use “treated” boards for deck joists – IF they will meet the strength requirements called for in building codes. Inspectors want to see “grade stamps” on the boards. The rubber strips will still be useful as the wood treatment does not penetrate to the center.

Excellent termite summaries from UC Davis Statewide Integrated Pest Management:

Overall Summary: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7415.html
Downloadable document available there: pntermites.pdf

More on Drywood Termites: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7440.html
Downloadable document available there: pndrywoodtermites.pdf

Copyright 2013 by Brandon D’Rion

 

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Termite Prevention and Construction Excellent termite summaries are available from UC Davis Statewide Integrated Pest Management (links at end of this article). Fighting off Subterranean (under ground) Termites: You should probably have a termite inspection periodically. Someone should crawl the whole crawl space looking at the foundations for evidence of subterranean (under ground) termites. They […]

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D'Rion Construction is owned and operated by Brandon D'Rion and is based in Glendale California. Offering Handyman Services and general interior and exterior remodeling services, Brandon is known in his trade by his ability to solve even the most difficult problems.

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