FLEXI®
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FLEXI The perfect friction fit for framed constructions

ROCKWOOL FLEXI® is a unique, flexible edged insulation product, specifically developed using patented technology for a fast and easy, perfect friction fit. The flexible edge ensures a perfect fit is maintained between the product and its supporting framework for easy installation and optimum effectiveness. Suitable for a wide range of applications including framed external walls, rafters, floors and partitions.

Advantages • Outstanding thermal, acoustic and fire properties • FLEXI Edge® ensures tight friction fit • Will not slump, even if studs shrink • Range of thicknesses and widths to suit multiple applications • Non-combustible - Euroclass A1 Description ROCKWOOL FLEXI® is a multi-use, thermal, acoustic and fire insulation product with a unique flexible edge along one side. The patented flexible edge ensures a perfect fit is maintained between the product and its supporting framework for easy installation and optimum effectiveness. FLEXI® is suitable for use between frames in walls,...

Performance Thermal ROCKWOOL FLEXI is available in a range of thicknesses and widths, with a thermal conductivity of 0.038 W/mK, and 0.035 W/mK at 140mm thicknesses and above. Fire classification ROCKWOOL FLEXI® achieves a reaction to fire classification of A1, as defined in EN13501-1. Thermal applications – timber frame walls The additional thermal benefits offered by using high performance (HP) breather membranes (BM) and vapour control layers (VCL) over standard membranes are shown below. Effective thermal resistance (R-values) comparisons used for external cavities are as follows: a....

"MSBS&Ss J->j J?jzai*b**v lid 13 - j wlif Construction 1: Cold frame with no service void Timber frame cavity wall, standard construction, insulated with FLEXI® between studs. Vapour control layer ROCKWOOL FLEXI® Breather membrane Construction 2: Cold frame with service void Timber frame cavity wall with separate 25mm battened service void, insulated with FLEXI® between studs: Vapour control layer ROCKWOOL FLEXI® Breather membrane Timber frame construction 2 - with service void

Construction 3: Warm/Hybrid frame (with no service void) Warm/hybrid timber frame cavity wall with ROCKWOOL FLEXI® insulation between studs and 50mm ROCKWOOL HP Partial Fill, fixed to face of OSB over breather membrane. Vapour control layer Construction 3 warm/hybrid timber frame - No service void (Standard BM & VCL) U-value W/m2K RW Partial Fill over OSB (mm) FLEXI® in frame (mm) Stud depth (mm) Note: The U-values shown in table 3 above can be further enhanced upon by the inclusion of a service void see construction 4 table below. Construction 4: Timber frame warm/hybrid frame construction...

Thermal applications - floors Suspended timber floor ROCKWOOL FLEXI® is installed between the floor joists, supported by polypropylene netting or a breather membrane. The insulation should be fitted as close as is practical to the underside of floor deck to avoid any air gaps: The P/A (perimeter area) ratio is determined by dividing the total of the exposed perimeter length of the floor by the area of the floor.

Fire protection: Upgrading existing timber floor to achieve one hour fire resistance 1 hour fire resistant floor based on fire test to BS476: Part 21 using ROCKWOOL FLEXI®. Remove existing floor boards and install a continuous run of 25mm ø chicken wire mesh across the whole floor. Form the mesh so that it follows the profile of the joists and the top face of the ceiling lining. 100mm ROCKWOOL FLEXI® is to fit tightly between the joists and supported by the mesh. Lay new floor of either 19mm flooring grade t&g chipboard or square edged boards with a layer of 3mm hardboard above or below the...

Robust details - Separating timber framed walls Robust details reference – E-WT-1 • Without sheathing board • Twin timber frames (for use in conjunction with timber frame dwellings and apartments) Twin timber frame with 50mm gap between FLEXI between the studs 2 layers of gypsum based board Thermal Regulations: Minimising heat loss via party walls • Wall width: a minimum of 240mm between inner faces of wall linings and a 50mm gap between the two frames. To assist in achieving a zero U-value for thermal applications we would recommend the following: • Wall lining: 2 or more layers of...

Robust details reference – E-WT-2 Separating wall - timber frame • With sheathing board • Twin timber frames (for use in conjunction with timber framed dwellings and apartments) Twin timber frame with sheathing, 50mm gap between FLEXI between the studs 2 layers of gypsum based board Thermal Regulations: Minimising heat loss via party walls • Wall width: a minimum of 240mm between inner faces of wall linings and a 50mm gap between studs. To assist in achieving a zero U-value for thermal applications we would recommend the following: • Wall lining: 2 or more layers of gypsum-based board...

Acoustic applications – partitions ROCKWOOL FLEXI® will provide both acoustic and fire benefits when used in partitions. Lightweight domestic timber stud partition: meeting Approved Document E2 (domestic internal partitions) Solution 1 - Timber frame 50mm (minimum) FLEXI between studs 12.5mm layer acoustic rated plasterboard • Studs: 38×75 timber studs at 600mm centres Facings: 1 layer 12.5mm acoustic rated plasterboard (11 kg/m²) each side Weighted sound reduction (Rw dB) Fire resistance (minutes) • Insulation: a minimum of 50mm of ROCKWOOL FLEXI® Nominal wall thickness (mm) Solution 2 -...

Enhanced performance (timber frame) - Typical office partition adjacent to factory 50mm (minimum) FLEXI between studs • Studs: 38×75 timber studs at 600mm centres Weighted sound reduction (Rw dB) • Facings: 2 layers of 12.5 mm standard plasterboard (16kg/m²) each side Fire resistance (minutes) • Insulation: a minimum of 50mm of ROCKWOOL FLEXI® Nominal wall thickness (mm) Enhanced performance (metal frame) - Schools, offices and public buildings: NBS Plus Clause K10:115, K10:125 70mm metal studs at 600mm centres 70mm FLEXI between studs 2 layers 15mm acoustic plasterboard • Studs: 70mm metal...