What types of wood are commonly used for building walls?

i am doing a school science project and want to testing the signal of a 802.11g wireless router, after going through a wall. I need multiple commonly used wood materials for walls, to exam.


Answers:    2X4's and 2X6's are the common studs although some buildings enjoy metal studs. Metal studs may affect you signal transmission.
Most walls inside a building are covered near sheet rock panels any 3/8 or 5/8 thick.
exterior walls may be any entity from plywood and chip board to rigid Styrofoam, brick and vinyl siding just to given name a few.
Fir and pine are the most commonly used for studs inside the walls. Sheetrock (drywall) or paneling for the flat surfaces.
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