I live in Clackamas Oregon and Terminex found in the crawlspace a 2×4 infested with powder post beetles (no other sign other than the one 2×4). They want to charge $4000 for entire house fumigation. YIKES!!
I would like to treat per your sites recommendation (Boracare and Timbor??) The floor is insulated thus it would be impossible to treat underside of floors unless I remove the insulation. Do you think it acceptable to treat all supporting braces, etc. and continue to monitor or should I treat all supporting plus use fogger?
Having treated powderpost beetle problems like this many times, here’s how I would go about doing the job.
First and foremost, I would not take any chances and leave the subflooring untreated. So even though this will entail extra work and cost, you should first remove the insulation that’s no doubt covering most if not all of the subflooring in between the floor joists. Now once you have all the floor joists, sill plate and subflooring uncovered and thus revealed, you can do a thorough inspection to make sure there are no other problem areas previously missed because of the covering.
Next, I’d apply the BORACARE by using a paint roller to every exposed piece of wood. This would no doubt be the very best way to apply it. Using a paint brush would be equally as effective. Spraying can be done but will typically lead to a lot of run off and hence waste. Lastly, fogging would lead to the same problem; lots of waste.
Now this does not mean you cannot fog. I fully understanding that going into this environment to treat is not the most exciting or fun way to spend some time. But if you want the best protection, using the paint roller or brush is the preferred tool in this “upside down” environment. But there is an alternative option.
An acceptable compromise would be to go into the space and use a paint brush or paint roller to treat just the worse areas, where the beetles have seen, and then to fog the space afterward which will then offer up some protection for the rest of the space. At least this way you know you got the important locations treated well and that hopefully this was the vital part of the treatment. This type of “compromise” is a personal decision only you can make and as a professional, I’d recommend painting the Boracare on as must of the wood as possible to get the very best results but if the activity noted does not appear to be new or current and it’s not a large area, the risk might be nominal. And if these conditions are true, then the risk involved could be nominal at worse.
Hope this helps; here are direct links to the information and products listed above:
Powderpost Beetle Article: http://www.powderpostbeetles.com/powderpost-beetle-control