Once upon a time, a hammer tacker was the best tool for attaching housewrap and roof underlayment to house sheathing. Now, according to builder Mike Guertin, it’s time to switch to cap fasteners. These tools are not only more effective but also are what you need to comply with manufacturer instructions and building codes. Caps are 1-in-dia. or larger plastic or metal disks fastened with nails or staples. The cap increases the fastener’s surface area, meaning less chance for tearing even under windy conditions or foot traffic. Pneumatic cap staplers are available in two styles: tools that attach lighter weight 20- and 21-ga. staples; and tools that attach 18-ga. staples, which have more holding power. Pneumatic cap nailers also are available. Additionally, National Nail makes a hammer tacker that has a manual cap-feed trigger.
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