Isocheck PRIMO & PRIMO HL Systems : overlay platform system direct to floorboards

Isocheck PRIMO & PRIMO HL Isocheck ULTIMO Isocheck 32T Isocheck 37T Isocheck 27C, 23C & 14C Isocheck 28T, 24T & 15T Isocheck RENOVO Isocheck Deep Batten Isocheck Shallow Batten Isocheck Cradle Isocheck Barrier Mat 5 & 10 Isocheck Impact Mat 100, 200 & 300 Isocheck Re-Mat 3 & Re-Mat 5 Isocheck Re-Mat Base 3 & 6 Isocheck Re-Cork 3 & Re-Cork 5 Isocheck Screedcheck XL5 Isocheck Screedcheck XL8 Isocheck Screedcheck XL10 Isocheck Phonewell Isocheck Absorba ceiling & wall panels Isowave System 23 for Walls Isowave System 23 for Ceilings Accessories

download PRIMO
product data sheet
download PRIMO HL
product data sheet
download PRIMO 26 & 30
product data sheet
installation instructions

NHBC Tested

0845 838 3399


•  New build - masonry
•  New build - timber frame
•  Conversions

Isocheck PRIMO systems are designed to reduce sound transmission through traditional / composite timber / steel joisted floors.

Isocheck PRIMO consists of an 8mm layer of melamine-free APF bonded to 18mm P5 V313 moisture resistant chipboard.

When installed as part of a complete party floor construction the system enables a timber floor to meet the sound transmission standards of Approved Document E 2003 and subsequent amendments in 2004, 2010 and 2013.

The Isocheck PRIMO system is also available in a high load version - Isocheck PRIMO HL - for bathroom and kitchen applications. This system enables all bathroom and kitchen fittings to be placed directly on the PRIMO HL board and facilitates a good base for tiling.


To be used over existing floorboards and traditional / composite timber / steel joisted floors for conversions or new build timber frame with a new resilient bar ceiling.

Performance (on the construction illustrated)

Treated floor with :
DnT,w+ Ctr
PRIMO or HL (timber frame)
PRIMO or HL (steel frame)
≥ 45dB
≥ 45dB
≤ 62dB
≤ 62dB

Product data

Overall size:

2400mm x 600mm x 26mm
2400mm x 600mm x 23mm
Resilient layer:

8mm APF
5mm Cross linked Isopoli

18.8kg per sheet
18.8kg per sheet


The acoustic floor shall be:

PRIMO & PRIMO HL system, supplied by Isomass Ltd. Units 10 & 11, Avenue Business Park, Elsworth, Cambridgeshire CB23 4EY and installed in accordance with manufacturer’s instructions / recommendations.


Apply Isocheck Acoustic Angled Flanking Band on the edges of the Isocheck boards just before they are pushed against the perimeter walls to isolate the board from the wall.

Lay Isocheck PRIMO & PRIMO HL system over a structural timber sub-floor, in brick bond pattern, applying Isocheck adhesive to all tongued and grooved panel joints.

Install skirting and trim off excess Flanking Band.

Full installation instructions for PRIMO & PRIMO HL are available to download by clicking on the link to the left of this page. Installation instructions must be used in conjunction with this information and/our information contained in the datasheet when laying the PRIMO & PRIMO HL floating floor system.

For advice on treatment of services and penetrations, consult our brochure.


To view a photograph mouse over the camera icon above

Isocheck PRIMO 26
  • Isocheck PRIMO or PRIMO HL.
  • 15mm thick plasterboard layer on floor deck.
  • 220mm x 50mm timber, composite wood or steel joists @ 400mm centres.
  • 100mm 45kg/m3 insulation between joists.
  • 20kg/m2 double boarded 25mm o/a plasterboard on resilient bars @ 400mm centres perpendicular to joist direction.
  • proprietary metal framed ceiling system to provide min. 100mm deep void with 12.5mm plasterboard layer.



For additional timber frame details including external (flanking) wall junction, separating wall junction and alternative flanking, refer to our brochure or the PRIMO product data sheet.

For kitchen and bathroom applications refer to the PRIMO HL product data sheet.

PRIMO boards can also be used in traditional timber joisted floors in non-timber frame applications. See the PRIMO 26 & 30 product data sheet.




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