direction of lower air pressure from high pressure. For example, if a building has negative air (more air being exhausted than is being forced into it, it is considered to have negative pressure). ?Vapor Movement ?through Diffusion and Air Transport. Vapor and air moves from warm toward cold driven by thermal differences (air currents) as well as the "
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amassing or concentration of absorbed liquid material. Solar heating can take rain, heat it to vapor and drive it toward the interior space of a building. How To Determine If Water Is Damaging A Wall System? Be alert for water damage to the surfaces and systems, although in many cases you will not be able to any damage. If the siding is deteriorating,
there is a good chance that there may be some damage behind it, However, in many cases,( i.e. metal or vinyl siding and synthetic stucco) the siding looks fine while the sheathing and the structural members lying behind the siding are deteriorating. The ability of the system to dry often determines the amount of damage done to the cladding and the structure.
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