Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT15250 – Mechanical InsulationIssue Date:September 28, 2012Page #:11 of 131. Exterior elastomeric insulation shall be installed with the longitudinalseam on the bottom of the pipe and shall be protected with an ultra violetresistive paint.2. Glue the butt ends of insulation to each other to form a homogenousmembrane maintaining the vapor barrier.J. Butt pipe insulation against pipe hanger insulation inserts. For hot pipes, apply 3"wide vapor barrier tape or band over the butt joints. For cold piping apply wetcoat of vapor barrier lap cement on butt joints and over staples and seal jointswith 3" wide vapor barrier tape or band.K. Fasten jacket to insulation using strapping and wing seals of the same material asthe cover. In exterior applications, insure that all seams are watertight. Followmanufacturer’s written installation guidelines.3.7 INSTALLATION OF DUCTWORK INSULATIONA. General: Install insulation products in accordance with manufacturer's writteninstructions, and in accordance with recognized industry practices to ensure thatinsulation serves its intended purpose.B. Install insulation materials with smooth and even surfaces.C. Clean and dry ductwork prior to insulating. Butt insulation joints firmly togetherto ensure complete and tight fit over surfaces to be covered.D. Maintain integrity of vapor barrier on ductwork insulation, and protect it toprevent puncture and other damage,E. Extend ductwork insulation without interruption through walls, floors and similarductwork penetrations, except where penetrations go through fire ratedconstruction.3.8 INSTALLATION OF EQUIPMENT INSULATIONA. General: Install equipment thermal insulation products in accordance withmanufacturer's written instructions, and in compliance with recognized industrypractices to ensure that insulation serves intended purpose.B. Install insulation materials with smooth and even surfaces and on clean and drysurfaces. Redo poorly fitted joints. Do not use mastic or joint sealer as filler forgapping joints and excessive voids resulting from poor workmanship.MECHANICAL INSULATION 15250 11