The rules state that the length of the fasteners should be approximately equal to the total thickness of the subflooring and underlayment to achieve maximum grip. You can fasten SurePly plywood underlayment with galvanized chisel-point staples with a 1/4″ max crown or flathead wood screw treated with zinc or galvanized with a moisture-resistant coating.Īvoid using drywall screws as they are not coated, and this can lead to rusting. The best rule of thumb for nail length is 1-1/2-inch nails for 1/2-inch-thick floors and one 3/4-inch nail for 3/4-inch-thick floors. You should use 1″ to 1-1/4″ long staples for thinner 1/4″ to 5/16″ thick flooring, 3/8″ long to 1/2″ thick floors, and 1-1/2″ long staples for 5/8″ thick floors. When installing underlayment for engineered flooring and thin solid wood floors. Similarly, installing 3/4″ flooring over two layers of 1/2″ plywood on a concrete slab. When fixing a 3/4″ solid wooden floor over a wooden subfloor with floor joists, use 2″ long cleat nails.
Project source 2 in 1 underlayment install#
When using cleat nails, use 1-1/2″ long cleat nails when installing thin 1/2″ thick wood floors.įor example, when you lay 3/4″ thick plywood directly on a concrete slab, use cleat nails 1-3/4″ long to install 3/4″ solid wood floors, so that the cleat nail is 3/4″ so the nail doesn’t go through the plywood. Use 1-1/2″ long staples for 5/8″ thick floors. You should use 1″ to 1-1/4″ long staples for thinner 1/4″ to 5/16″ thick floors. There must be a wood or plywood subfloor to staple or nail. Staples or nails will not hold concrete or other hardboard types of subfloor material. When installed with staples, underlayment sheets are fastened every 2 inches along the edges of the sheet and every 4 inches in the field area. Factors to Consider When Installing Underlayment.What Types of Fasteners Are Suitable for Underlayment?.
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