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We’re renovating a Pueblo style adobe w/ exposed beams or vigas as they’re called here. The existing ends are rotted all the way into the interior–ruining the beams. I want to attach new false exposed beams to the rim joist prior to plastering and have considered metal plates w/ arbors. But this too might rot. Looking for a way to protect these ends also w/out using pressure treated–which isw not allowed in the historic district Thanks!
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Ray, One consideration is the choice of timbers you use. I would venture that the existing vigas may be ponderosa pine. Try using doug fir. It is still native to the region and a better choice of wood for exposed conditions. Regardless of timber used, I have had good luck using Briwax or other furniture paste wax on exterior weather proofing. You rub a healthy ampount into the wood, especially the end grain . After a few days of sunshine, wipe off any excess. In a really dry sunny climate, you will need to replenish every few years. You could also start the treatment by coating the vigas with straight tung oil or a mixture of 1:1:1 tung oil, turpentine and spar varnish. Brush on and let sit for io minutes then wipe of the excess. Then wax. Another possibilty I have used here on exposed beam ends, is to make a copper flashing cap. This may not be an approved component for traditional adobe.
I would definitely seal up any checking, or splits in the top or weather side of the beams. ZAR makes an excellent wood filler suitable for exterior use if sealed with the oil or wax.
Hope this is helpful
walk good
david
*Ray, Is the wood painted, stained or just weathered as a finish? Jim
*RayDon't take chances with rotten beams. You might want to consider cedar beams. They might be costlier and harder to get, even slightly weaker, but they are naturally more resistant to the environment. In any case, definitely cover it with Kilz or some other oil-based finish. It will protect more than a water-based. Best of luck.Josh
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We're renovating a Pueblo style adobe w/ exposed beams or vigas as they're called here. The existing ends are rotted all the way into the interior--ruining the beams. I want to attach new false exposed beams to the rim joist prior to plastering and have considered metal plates w/ arbors. But this too might rot. Looking for a way to protect these ends also w/out using pressure treated--which isw not allowed in the historic district Thanks!