Duct Sealing in Knights Landing, CA

What leaks in Knights Landing duct systems

Knights Landing sits inside the Yolo Bypass flood zone. Houses here were built up on piers for that reason. Wind crosses the rice checks and enters those crawlspaces unobstructed. Duct tape dries out fast in moving air. Peel a wrap off an old boot. If the cloth comes away stiff and the glue is powder, every joint under that floor is the same age and condition.

Burning rice straw is mostly gone, but tillage dust is not. That dust shows up as a gray film inside return platforms. Framed return platforms under a hallway floor are rarely sealed to the subfloor. They pull crawlspace air through the stud bays. Seal the platform before anything on the supply side, or you just pressurize the problem.

Manufactured and older mobile homes along the river fail differently. The crossover duct under the belly board sags, then splits. Ground squirrels finish it. Flex has two layers and both need separate attention: inner liner banded to the collar, jacket banded over insulation.

Fog season keeps crawlspace humidity high for weeks. Mastic skins over slowly down there. Work gets scheduled around that, not against it. Pressure pan readings before and after show whether the sealing held.