Tapered Roof Board TR/MG

Insulation for Single Ply Fully Adhered/ Partially Bonded Built-Up Felt Systems

Xtratherm TR/MG is a high performance Polyisocyanurate with mineral coated glass facers suitable for use below single ply fully adhered roof membranes, single ply waterproofing systems and partially bonded built-up felt.

Bonded boards

The insulation boards are embedded in a layer of bitumen on a 3G type felt to BS 747 (Reinforced bitumen sheets for roofing specification) that has been adhered to the deck. (Xtratherm recommend that all systems should have mechanical fixings included or be adhered using other suitable adhesive).

Product Benefits

1. Xtratherm TR/MG boards should be laid over the vapour control layer in a break bonded pattern. The long edges of the boards should be laid at right angles to the corrugations and all board joints must be fully supported by the deck. The TR/MG insulation boards are generally secured by approved mechanical fixings or adhered using other suitable adhesive. The requirement for a separate water vapour control layer should be assessed in accordance with BS6229.

2. Xtratherm TR/MG boards are suitable for use on roof decks that are subject to maintenance traffic. Walk-ways should be provided on roofs requiring regular pedestrian access. When the roof is complete, protective boarding should be laid if additional site work is to be carried out.

3. Xtratherm TR/MG mineral coated glass faced boards are suitable for use below most single ply fully adhered mechanically fixed roof membrane systems and most partially bonded built-up felt systems.

Additional Infomation

Mechanically fixed boards. A vapour control layer lapped and sealed with should be used below the insulation. When using fully adhered systems, board joints should be taped subject to adhesive system being used. (Contact system supplier.)

The fire rating when tested to EN 13501-5 and BS 476 Part 3 ‘External Fire Exposure Roof Test’ will be dependent upon waterproofing system specified.

Decks should be dry and clean of debris with tapered components laid to achieve the designed falls. The boards can be secured using approved mechanical fixings and washers, with boards laid with a break-bonded pattern or can be adhered using other suitable adhesive. Joints should be closely butted.

Decks should be dry and clean of debris. The boards can be secured using approved mechanical fixings and washers, with boards laid with a break-bonded pattern. Joints should be closely butted. Alternatively the boards can be adhered also to the decking with approved adhesive systems.

Partially bonded built–up felt waterproofing should be laid, where in accordance with BS 8217 (Reinforced bitumen membranes for roofing. Code of practice).

Xtratherm TR/MG is suitable for use with most fully adhered single-ply waterproofing membranes. Board joints and abutments should be taped subject to the approved adhesive system being used. A fleeced backed membrane might be required with the system being used, check with the system manufacturer.

The facing of Xtratherm TR/MG should not be considered as temporary waterproofing, when work is interrupted or at the end of each day, a night joint must be made to prevent water penetration. Xtratherm tapered boards should be waterproofed as soon as possible after fixing.

Depending on the fixings specification chosen, quantity and pattern of fixings will vary with the location, roof height/width and topographical data. Architectural specification should be consulted. Generally with 1200mm x 1200mm boards, a minimum of 4 fixings per board are adequate, located between 50mm and 150mm from all edges. If more than one layer of insulation is being used, the flat board packers should be mechanically fixed with a minimum of one fixing before fixing profiled boards as detailed. Additional fixings around roof perimeter of the roof may be required.

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