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What types of wood are commonly used for building walls?

i am doing a school science project and want to test the signal of a 802.11g wireless router, after going through a wall. I need multiple commonly used wood materials for walls, to test.
MZ thank you very much, In that case, what would i test, sheetrock?, metal studs? someone please answer

Try use pinus, or eucalyptus. But don't worry about the wood type. If one kind of wood absorbs X signal power, other kind of wood will absorb the same X signal power, as long as it has the same density. Woods used in civil construction are very similar!

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