6-88 Sectio N 622 – Insulatio N Board
622.0 1 DESCRIPTION . This work shall consist of furnishing and installing extruded or expanded polystyrene insulation board on a prepared surface. 622.0 2 MATERIALS . Materials shall meet the requirements of the following subsection s: Sand Borrow and Cushion ................................ ................................ ......................... 703.03 Polystyrene Insulation Board ................................ ................................ ..................... 735.01 Skewers shall conform to the requirements of the insulation manufacturer. 622.0 3 PREPARATIO N OF SURFACE . The s urface shall be prepared as follows:
a.The surface on which insulation board is to be placed shall be shaped as shown on the Plans . Any unsuitable material shall be replaced with satisfactory material . The surface shall be compacted to attain at least 95% of the maximum dry density and the in -place moisture content shall be not more than 2% above the optimum moisture content, as determined by AASHTO T 99, Method C .
b.When sand borrow is required, it sh all be spread and compacted to a minimum depth of 3 inches just prior to the placement of the insulation board.
c.Compaction shall be performed in accordance with Subsection 203.11(d) . 622.0 4 PLACEMEN T OF INSULATION . The insulation board shall be placed and secured as follows:
a.The boards shall be placed in such a manner that the transverse joints will be staggered . If two layers of insulation are used, the second shall be placed to cover the joints of the first layer.
b.Means will be provided to ensure a straight alignment of the boards.
c.A minimum of two skewers, as approved by the Engineer, shall be used to hold each insulation board in place. The skewers sh all be driven at an angle of less than 90° from the horizontal until flush with the surface of the insulation boards. Skewers shall be used for each layer when more than one layer of material is used.
6-89 622.0 5 PLACEMEN T OF MATERIA L ON THE INSULATIO N BOARD . Special care shall be taken
that the equipment used in placing the material does not operate directly upon the installed insulation board. The first layer of material shall be placed to a minimum depth of 8 inches, loose measurement, by dumping in pil es and then moving it forward onto the insulation board by approved equipment . The first layer of material shall be compacted to the satisfaction of the Engineer . The compaction of subsequent layers shall be made with the same construction procedures required for the type of material being placed. Any insulation board that becomes displaced or damaged prior to or during placing of the material shall be repositioned or removed and replaced with new insulation board at the Contractor’s expense. 622.0 6 METHO D OF MEASUREMENT . The quantity of Insulation Board to be measured for payment will be the number of thousand feet board measure (MFBM) installed in the complete and accepted work , based on the nominal dimensions of material . No allowance will be made for waste. 622.0 7 BASIS OF PAYMENT . The accepted quantity of Insulation Board will be paid for at the Contract unit price per thousand feet board measure ( MFBM ). Paymen t will be full compensation for furnishing, transporting, handling, and placing the material specified and for furnishing all labor, tools, equipment , and incidentals necessary to complete the work , except that sand will be paid for under pay item 203.3100 . Payment will be made under: Pay Item Pay Unit 622.10 00 Insulation Board ................................ ................................ ........................ MFBM
6-90 Section 625 – Utility Systems
625.01 DESCRIPTION . This work shall consist of furnishing and installing utility sleeves, concrete encased and direct burial conduit, junction and pull boxes, power drop stanchions, utility vaults, and other utility equipment and components as specified on the Plans. 625.0 2 MATERIALS . Materials shall meet the requirements of the following subsections: Sand Borrow and Cushion ................................ ................................ ......................... 703.03 Brick ................................ ................................ ................................ ........................... 705.01 Mortar, Type II ................................ ................................ ................................ ........... 707.01(c) Mortar, Type IV ................................ ................................ ................................ ......... 707.01(e) Joint Sealer, Hot Poured ................................ ................................ ............................ 707.02(a) Preformed Joint Filler, Cork, and Asphalt -Treated Felt ................................ ............ 707.06 Polyvinyl Chloride (PVC) Waterstop ................................ ................................ ........ 707.08 Reinforced Concrete Pipe ................................ ................................ .......................... 710.01 Acrylonitrile -Butadiene -Styrene (ABS) Plastic Pipe ................................ ................. 710.0 4 Polyvinyl Chloride (PVC) Plastic Pipe ................................ ................................ ......710.0 5 Corrugated Steel Pipe, Pipe Arches, and Underdrain s ................................ .............. 711.01 Corrugated Aluminum Alloy Pipe, Pipe Arches, and Underdrain s ........................... 711.02 Bar Reinforcement ................................ ................................ ................................ .....713.01 Plastic Pipe, Flexible ................................ ................................ ................................ ..740.01 Rigid Polyvinyl Chloride (PVC) Electrical Conduit ................................ ................. 752.0 6(a) High -Density Polyethylene (HDPE) Electrical Conduit ................................ ............ 752.06(b) PVC Coated Rigid Metal Conduit (RMC) ................................ ................................ .752.06(c) Junction Boxes ................................ ................................ ................................ ........... 752.09 (a) Pull Boxes ................................ ................................ ................................ .................. 752.09(b) Power Drop Stanchion ................................ ................................ ............................... 752.14 Concrete shall conform to the requirements of Section 541 for Concrete, Class B. All wood blocks used as skids shall be oak or maple structural lumber No. 2 Grade or better. All prefabricated casing spacers shall be designed for the intended application and be of the centered restrained type. Stainless steel strapping shall meet the requirements of ASTM A666. Sleeves for power and communication lines shall be non -metallic.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 862–863 of 1,380.