What is the main job of siding on a house?
AnswerProtecting the walls from weather
Siding sheds rain, snow and wind to protect the wall structure behind it.
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Siding facts & stats
8 fact-checked facts about house siding, each with the reason behind it. 4 more are in today's round and join this page after it closes.
The basics
Vinyl siding is a type of what material?
AnswerPlastic
Vinyl siding is made from PVC, polyvinyl chloride, a plastic.
Going deeper
In siding and roofing, a 'square' covers how much area?
Answer100 square feet
Contractors measure siding and roofing in squares: 10 by 10 feet, or 100 square feet.
Fiber cement siding is made mainly from which ingredients?
AnswerCement, sand and cellulose fibers
Fiber cement combines Portland cement, sand and wood-pulp fibers into durable boards.
What is the underside of a roof overhang called?
AnswerSoffit
The soffit covers the underside of the eaves; the fascia is the vertical board along the roof edge.
What does house wrap installed behind siding do?
AnswerBlocks liquid water while letting water vapor escape
House wrap is a weather-resistive barrier that catches water getting past siding but lets walls dry out.
Expert level
Why doesn't aluminum siding rust?
AnswerRust is iron oxide, and aluminum contains no iron
Aluminum does react with air, but it forms a thin protective oxide layer rather than rust.
What are the small gaps left at the bottom of brick veneer walls, called weep holes, for?
AnswerLetting trapped water drain out
Water that gets behind brick veneer runs down the air space and exits through weep holes.
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