Gypsum Associotion Approves the Double-Noiling Technique

An antidote for nail pops caused by mechanics' failure to hold CypsuT wallboaid snugly against framing members dyli"* nailing is.seen in the Gyp-sum Association;s approval of the double-nailing techniqui.

Experience has Jhown that even when all other safeguards are observed . .-namely, use of sufficiently dry lum_ ber, proper nailing and framing, and correct rvallboard sizes .,..loose holding.of board still can produce ,,popping.', Where such failures persist, double nailing^is^deeried an effective remedy.

However, no departure from the existing ,,single-nailing" method, which calls for y, to 7" o.c. spacin! for jeilings afrd h h

DOUBII TAIUf,G oYPSUT WA11BOARD

6'.' to g' o.c. for sidewalls, is recommended obtaining satisfactory results.

h-r the double-nailing system, nails are driven first into the field of the board "at -12', intervals. They are then fol- lor"'ed by a- second series of nails spaced trio inches from those already in olace.

As each "ieconh nail".is. d.riven home, the mechanic gives an insurance blow to adjoining first naii. This takes ,p-"r.y slack that u'as developed by sEcondary nailing. Care silouli be taken only to "dimple" 6oard surfice iot break face paper by "-over-driving."

spacrng tor narls at perimeter of board should be 6,, to g,t o.c. for sidervalls, and 5,, to 7t, o.c. for ceilings.

, Although failure.to h_old board tightly against framing nas l)een recognrzed as the major factor for all nail popping-, for crer,vs already