Isocheck Adjustable Acoustic Cradle

Typical applications
To be used over hollow core, in-situ or supported metal deck concrete floors for new build or conversions as illustrated or approved by Isomass (on application to technical@isomass.co.uk for our free acoustic detail design service).

Incorporating an underfloor heating system
Isomass Ltd has developed a number of acoustic floor solutions that could complement the requirement for underfloor heating. The company’s experience in acoustics will ensure that the integration of the underfloor heating system meets your requirements. The floor details shown (see details tab) are known to comply with Approved Document E of the building regulations and in some cases Robust Details. Should they not match your requirements, please contact Isomass Ltd. who will be happy to discuss suitable alternatives.

For flat roof terraces
Our Adjustable Cradle and batten system is also designed to work with decking in an inverted flat roof. It opens up endless possibilities for the design and layout of an outdoor space in a roof terrace. As flat roofs need to have a minimum finished fall of 1:80 (as defined in BS 6229:2018) to ensure water will not pond on the roof surface, Isocheck Adjustable Cradle and battens will allow the finished surface to be actually flat - so providing a usable terrace area. See details tab for a typical terrace application.

Typical applications


• 18mm or 22mm chipboard floor.
• Isocheck Adjustable Cradle with a (commonly used) strength-graded 45mm x 45mm batten @ 400mm centres.
• 130mm min. in-situ concrete (80mm min. fully supported) on profiled metal deck (left) or
• 150mm min. hollow core concrete plank min. 300kg/m² excluding screed (right).
• Metal frame suspended ceiling with 75mm void and 10kg/m² plasterboard or with 100mm void and 8kg/m² plasterboard.

Incorporating an underfloor heating system


• 18mm or 22mm chipboard floor.
• Isocheck Adjustable Cradle with a (commonly used) strength-graded 45mm x 45mm batten @ 400mm centres.
• 25mm mineral fibre insulation 36kg/m³ with pipe fixings (left).
• 130mm min. in-situ concrete (80mm min. fully supported) on profiled metal deck or
• 150mm min. hollow core concrete plank min. 300kg/m² excluding screed.
• Metal frame suspended ceiling with 75mm void and 10kg/m² plasterboard or with 100mm void and 8kg/m² plasterboard.
• alternative arrangement using propriety supporting pipework tray (right).

For flat roof terraces


• hardwood timber deck.
• Isocheck Adjustable Cradle with a (commonly used) strength-graded 45mm x 45mm batten* @ 400mm centres. If required, the adjustable Cradle can be placed on WBP plywood spreader plates. *deeper battens can also be used.
• Mechanically fixed or fully adhered single ply membrane.
• Rigid insulation fixed to timber deck (for example, foil-faced polyisocyanurate (PIR) insulation) - type, thickness and fixing requirements as specified by the Architect.
• Vapour control layer (AVCL) (for example, min. 1000 gauge (250μm) polyethylene sheet).
• 18mm min. plywood deck over timber firrings.
• 150mm x 50mm timber joists at 400mm centres with 100mm mineral fibre insulation between the joists.
• Isocheck Isoblock and Isobar system fixed to underside of joists. Please refer to separate product datasheet and installation instructions, available from Isomass, for details.
• Two layers of staggered, sealed 12.5mm sound-grade (fire rated) plasterboard (min. total combined mass 22kg/m²).