Vapor barrier installation in Alhambra CA - a crawl space floor that stays covered

Most people call because of a musty smell from under the floor, cold floors in the rooms above, or a damp patch of dirt a plumber noticed, and the real question is whether plastic will take care of it or whether water is getting in that has to be fixed first. The price mostly follows the size of the crawl space, how much has to be cleared out, how heavy a sheet suits your house and whether any drainage work comes first, and that last part moves the schedule most, because I would rather wait than lay a cover over ground that's still getting wet. Your own figure comes from the estimate, which I do on site after looking under the house with you.

I start outside with you, looking at how the yard slopes, where the drainage sends water and where the sprinklers hit near the foundation, because a plastic cover can't keep up with water that keeps running in. If water is getting under the house, we talk about fixing that before anything else. Once the ground is ready, we clear out stored items, old debris and any torn plastic so the new sheet can cover the floor completely, then we lay it across the whole floor, with extra protection along any path someone uses to reach the furnace or water heater.

A ground cover takes care of the floor, and the rest of the house often needs its own attention. When the upstairs runs hot, attic air sealing closes the gaps around lights, pipes and the hatch before more insulation goes up there, and in an older house with thin or missing insulation, retrofit insulation adds it to the walls and attic you already have. I'm glad to look at those on the same visit, and I'll tell you plainly if the crawl space should come first.

The Alhambra Building Division issues permits for most home construction work in the city, and its list names jobs like roofing, structural repairs and duct work but doesn't mention vapor barriers, so that list alone doesn't settle whether your job needs one. I check with the city's building office before we start rather than assume. If your job does need a permit, we pull it and keep you informed through the inspections.

Many of the houses we go under here are older raised-floor homes with lawns or planters watered right up against the foundation, which is why the sprinkler check comes before the plastic. We see the same kind of houses on jobs in San Gabriel and Monterey Park, and we work in many other cities around Alhambra too, so please ask if yours isn't listed.