Maxiboard for Walls - Installation Guide

Masonry Walls installation | Timber Stud Installation | Maxi HP Installation

Masonry Walls

Maxiboard can be applied to most 100mm dense and lightweight blockwork or double skinned brick walls to improve the sound insulation or to meet Approved Document E (2003).

Maxiboard on resilient bars

SRS Resilient Bars are fixed horizontally across the wall. Resilient Bars should be placed at the top and bottom of the wall and then at 600mm centres from the bottom upwards. Where the Resilient Bars are applied directly to the wall, 25mm glass fibre should be installed in between them.

The boards are fixed to the Resilient Bars using 3.9 x 30mm SRS Maxi Screws. The existing masonry wall will need to be completely free of moisture before the Maxiboard is installed. To ensure the back of the Maxiboard is protected from moisture, it may be necessary to install a damp proof membrane. Maxiboard must be installed in a brick pattern, with staggered joints, and the utmost care should be taken to ensure there are no gaps. A bead of SRS Gripfix should be applied to the shiplap edge of the Maxiboards as they are placed together.

Where Maxiboard abuts a wall, floor or ceiling, the shiplap edge should be removed so the board sits flush to the adjunct. The edge should then be treated with a bead of SRS Acoustic Sealant to reduce sound transmission into the existing structure. Any further inconsistencies or gaps should be treated with a general purpose filler to ensure acoustic integrity.

For increased acoustic performance or to remedy any unevenness in the existing wall, 25 x 50mm timber battens should be fixed vertically at 600mm centres with 25mm glass fibre hung between them. The Resilient Bars and Maxiboard panels are fixed to the timber battens using the same fixing spacings and installation method as described above.

SRS recommend that plasterboard be fitted over the Maxiboard and finished according to manufacturers instructions. Please see ‘Finishing and Plastering’ section for finishing details.

Maxiboard on battens and resilient bars

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Existing Timber Stud and/or Plasterboard Partitions

Should the plasterboard remain on the studwork it should be removed from one side of the partition and the area between the existing studs filled with a 50mm mineral fibre. SRS Resilient bars should then be placed at the top and bottom of the wall and then at 600mm centres from the bottom upwards.

The Maxiboards are then installed exactly as described in the Masonry Walls section above. If the plasterboard on the other side of the studwork is in good condition it can remain, with an extra layer of 12.5mm fire rated plasterboard fixed directly through the existing plasterboard, into the studwork.

If the existing boards are damaged, they should be replaced by two layers of 12.5mm fire rated plasterboard with all offset joints. For the Optimum acoustic performance any sockets or switches that need to be installed on the Maxiboard wall should be surface mounted, or flush fitted using SRS Acoustic Socket Boxes.

SRS recommend that plasterboard be fitted over the Maxiboard and finished according to manufacturers instructions. Please see ‘Finishing and Plastering’ for further finishing details.

Maxiboard timber stud partition

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Maxi HP Partition System

Prior to installation, the self adhesive Maxi HP felt is applied to the recess on the outside of the floor channel. The floor and soffit tracks are then secured prior to fitting Maxi studs, which are positioned at 600mm centres. Please note the studs are not secured to the floor and soffit channels.

All stud mesh profiles are fitted in same direction. 50mm mineral fibre slab, of nominal 590mm width, is placed within the stud cavity. Maxiboard panels are then fixed to the studs in a brick pattern with half panel overlap, using 3.9 x 30mm SRS Maxi Screws.

The partition is constructed with the 10mm lighter coloured gypsum side of the board facing outwards, unless specification requirements determine otherwise, ready to be skimmed (please see finishing instructions) or drylined. Fixings are at a maximum of 250mm centres with the lowest fixing not greater than 30mm from the floor and the uppermost fixing at 60mm from the head. All fixings are positioned at 20mm from the edge of the Maxiboard. The uppermost Maxiboard panels are fitted 5mm short of the perimeters, with a bead of intumescent sealant being used to fill this gap.

SRS Gripfix is applied to all shiplap edges of the Maxiboard panels. All face joints are filled and screw heads spotted out with a standard filler. Where Maxiboard abuts a wall, floor or ceiling, the shiplap edge should be removed so the board sits flush. A bead of SRS Acoustic Sealant should be applied to the edge of the Maxiboard when fitting to ensure isolation from the existing structure.

When installing a door into a Maxi HP partition you will need a door casing to suit the thickness of the partition. The total unfinished thickness is 109mm. It is also important to note that the inclusion of a door, in any partition system, will have a detrimental effect on the overall acoustic performance. For optimum acoustic performance, all sockets and switches should be surface mounted or flush fitted with SRS Acoustic Socket Boxes.

SRS recommend that plasterboard be fitted over the Maxiboard and finished according to manufacturers instructions. Please see ‘Finishing and Plastering’ section for further finishing details.

Maxi HP