SCOPE:
The work consists of furnishing all materials,labor and equipment necessary to install Metal-Edge Tongue and Groove precast concrete plank as shown on the drawings and in accordance with the following specifications:

MATERIALS:
All roof deck and floors shall be of Metal-Edge Tongue & Groove Plank manufactured by MidCon Products, Inc., Hortonville, Wisconsin. The plank shall be made of lightweight insulating concrete adequately reinforced with galvanized welded wire mesh. The compressive strength of the concrete shall be 1500 psi when tested at 28 days. Edging shall be a tongue and groove section made of 22 ga., prefinished, cold-rolled, galvanized steel. Finish shall be smooth on one face and standard Realite® acoustical finish on the exposed face. Under special conditions, when specified, denser concrete shall be used. In critically moist environments, stainless steel metal edging shall be used.

SHOP DRAWINGS:
When required, shop drawings based on the structural layout shall be submitted by the plank manufacturer for approval before proceeding with the manufacture of the plank.

INSTALLATION:
The installation of the plank shall be performed in a workman like manner and in accordance with the manufacturer’s recommendations. Attachment to the supporting member shall be one of the following, or as recommended by the manufacturer: 

1. Steel, concrete or wood supporting member-

2. One galvanized purlin clip nailed to the plank edge at each support.
3. Use one self-drilling galvanized metal fastener through each plank at each support.
4. Weld leading metal edge to structural support with a fillet weld using a minimum of one inch of weld per plank. Welding voltage to be set so as to minimize burning through the metal edge.
5. For applications with pitches greater than 30°, plank must be welded or thrust angles must be used in conjunction with standard attachment.

For other applications, contact manufacturer for recommendation.

Installation shall begin at a building corner, plank placed with smooth side up and groove edge leading. Plank should be installed across roof supports with ends staggered a minimum of 24”. The first row of plank shall start with a plank having a minimum of two structural supports. All plank must have at least one structural support. At building perimeter, ridge, and valley all plank ends and edges without metal edging must occur over continuous support. 

Tongue and groove sides and ends of all plank shall be firmly mated to form tightly closed joints when viewed from above the plank surface. Finished deck shall provide a smooth surface ready for roofing application. 

Holes: All holes shall be site cut and shall be centered between the metal edges. For any openings greater than 12” on any dimension, suitable framing angles should be utilized. 

STORING: For exterior storage, plank should be stacked on edge with a minimum of 3” between stacks and 3” from the ground. 

RELATED WORK OF OTHER SECTIONS:
Built-up roofing may be applied by nailing dry roofing felt as per roofing specifications for wood decks. If base felts or insulation is nailed to the plank, nails should be driven at an angle. A galvanized roofing nail which will provide a minimum of 1-1/2” of bury in the concrete plank shall be used. Where the material to be attached requires substantial pullout forces, a Buildex Tapcon® fastener should be used.

Cants, curbs, saddles and deck openings, framing shall be provided by others,
Bearing surfaces of supporting members shall be kept free and clear of  bolts, rivets, bridging and any other obstruction s that would interfere with proper seating of precast T & G plank.