Roof Insulations - Page 21

	Roof Insulations
	NTB 1H & 2H Fasteners

Description

NTB is a ¾ " (19 mm) diameter, glass reinforced nylon fastener with a double internal hex drive. It is available with or without the locking wire barbs. NTB-1H has a 1" (25 mm) diameter head. NTB-2H has a 2" (51 mm) diameter head. Both products must be used with stress plates, either metal or plastic.

NTB Metal Plate is a 3" (76 mm) round, Galvalume metal plate, for use with NTB-1H and plastic plates are 3" (76 mm) round for use with NTB-2H.

Use

NTB is a specialty fastener for fastening roof insulation to either cementitious wood fiber or gypsum roof decks. The fastener and plate system provides positive attachment and resistance to up-lift forces.

A pullout test to determine the integrity of the deck is required for all NTB installations.

Advantages

• Increased pullout and backout resistance
• Minimized fastener breakage
• Fast, easy installation
• Smooth surface at contact point reduces membrane abrasion
• NTB Fasteners are Factory Mutual and Dade County approved
• Reduction in thermal bridging

Application

NTB Fasteners should be installed using a heavy-duty, variable speed drill with an NTB Eliminator drill attachment. Installation at low rpm is recommended.

To install NTB into cementitious wood fiber decking, simply position the plate over the insulation and drive the fastener through the plate into the deck.

In a gypsum deck, pre-drilling a 7/16 " (11 mm) pilot hole is required (depending on substrate hardness, a 9/16" [14 mm] pilot hole may be required). The pilot hole should be a minimum of 1/2 " (13 mm) deeper than the required embedment into the deck. Minimum fastener spacing should be the FM usage rates and patterns appropriate for the size and type of insulation. More fasteners may be needed based on pullout tests, as deck pull strengths vary. Minimum recommended embedment for NTB fasteners is 1½ " (38 mm) into the deck material. The NTB fasteners should not penetrate the underside of the deck.

Sizes

Available in lengths from 2 ½ " (64 mm) for insulation up to 1" (25 mm) in thickness to 7 ½ " (191 mm) in length for insulation up to 6" (152 mm) in thickness.

Packaged in 500 (up to 5" [127 mm] and 250 over 5" [127 mm]) fasteners per carton and 1000 plates per carton (separate).