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Homebuilding: Laying Tongue And Groove Plywood
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You have just finished framing the first floor deck for a brand new home and your ready to start putting down the 3/4" tongue and groove plywood. If you framed it well and got your 16" centers laid out right, the process should go smooth as silk. The key to success is in the framing of the joists.

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The first step in laying plywood over the floor joists is to snap a chalk line. This gives you a straight line to follow. I always snap this line at 48 1/4" in off the edge of the rim joist. This ensures that in the course of installation the plywood (which is 48" wide) will not hang over the edge of the rim joist. It doesn't matter whether you start in the front or back of the house. For best results, start where you have the longest run without a jog in or out in the foundation.

After you have snapped your line, determine which joist the first sheet of plywood will break. If the joists where laid out 16" o.c. (on center) from the end of the building, the edge of the plywood would split the joist at 8 feet. Sometimes the roof layout determines the floor joist layout. This is usually the case when the roof is a hip roof. In this instance start with the joist that will allow the plywood to cover all the joists, even if it hangs over the edge of the first joist. This will be cut off later.

After you have determined where to start, apply construction adhesive to the top edge of the joists. Apply no more than 48" the width of the plywood. Lay the first sheet in the glue with the groove edge on the chalk line. Holding the sheet to the line, nail the leading edge of the plywood to the rim joist so it splits the joist. You'll be covering 3/4 of an inch of the joist with 3/4" exposed. Still holding the

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