653Polystyrene Plastic Insulation

653.01 Description This work shall consist of furnishing and installing a polystyrene

plastic insulating layer at locations designated on the plans in accordance with these specifications. 6-163

653.02 General Insulating material shall be extruded polystyr ene insulating board

conforming to the requirements of AASHTO M230. Pegs shall be hard wood, approximately 6 inches by ¼ inch roun d, pointed on one end.

653.03 Preparation of Foundation The insulating boards shall be placed on a

compacted layer of granular material graded to a tolerance of ½ inch above or below the required grade and cross section. The surface shall be free of rocks that would cause damage to the insulating boards. The type and thickness of the granular material will be as shown on the plans.

653.04 Placing Insulating Boards The insulating boards shall be secured to the

ground with pegs placed at each corner or where directed by the Resident, and driven flush with the surface of the insulating board. Joints between the insulating boards shall be staggered. The openings in all joint shall be kept to a minimum.

653.05 Placing Backfill After the insulating boards have been placed, granular

material shall be placed using care to avoid pushing or puncturing the boards. The depth of the first layer of aggregate subbase sand shall not be less than 10 inches loose measure. The aggregate subbase sand shall be spread with a crawler type bulldozer of not more than 2000 lb/ft² ground contact pressure or with other approved equipment but not supported directly on the insulating boards. Trucks and other heavy construction equipment shall not be operated directly on the insulating boards. The type and thickness of granular material will be shown on the plans.

653.06 Compaction Compaction of the first layer of aggregate subbase sand shall be

by vibratory methods to the satisfaction of the Resident. After the first layer has been compacted, normal construction practices may be followed providing no loads are placed on the area that produce more than 2000 lb/ft² ground contact pressure.

653.07 Protection of Polystyrene Since gasoline, oil, heat, a nd sunlight will damage

polystyrene, all precautions shall be taken to prevent them from damaging the insulating board. The insulating boards shall not be stored in sunlight for more than one day.

653.08 Method of Measurement Polystyrene plastic insulation w ill be measured by

the square yard in place.

653.09 Basis of Payment The accepted quantities of polystyren e plastic insulation

will be paid for at the contract unit price per square yard complete in place. Payment shall be full compensation for and for furnishing and placing the insulating boards of pegs. Payment will be made under: 6-164 Pay Item Pay Unit

653.20 1 inch Polystyrene Plastic Insulation S q u a r e Y a r d

653.21 1½ inch Polystyrene Plastic Insulation S q u a r e Y a r d

653.22 2 inch Polystyrene Plastic Insulation S q u a r e Y a r d

653.23 3 inch Polystyrene Plastic Insulation S q u a r e Y a r d