Maxiboard for Ceilings - Installation Guide

Maxi 60 Ceiling

Maxiboard can be installed onto a ceiling in order to meet Approved Document E of the Building Regulations (2003) and also achieves 1 hours fire protection. Firstly 100mm 45kg/m3 mineral wool slabs are friction fitted between the joists. SRS Maxi Resilient Bars are then fixed to span the timber joists across the full width of ceiling, using 70mm x 5mm self-drilling screws. They are fitted at the edges of the ceiling and at a maximum of 300mm centres in between.

The Maxiboard panels are fixed into the Resilient Bars using 30mm x 3.9mm SRS Maxi Screws. Fixings must be to the Resilient Bars alone and not through into the timber joists. The Maxiboards are secured in a staggered half panel overlap, with the 10mm white gypsum layer facing outwards, unless specification requirements determine otherwise. The screw fixings are at a maximum of 300mm centres, positioned 20mm from the edges of each board and at the midpoint. A bead of SRS Gripfix is applied to each panel’s shiplap edge prior to installation. Where the Maxiboard panels adjoin a perimeter wall, the shiplap edge should be removed, and a bead of SRS Acoustic Sealant applied to the edge. It is essential that no gaps occur between the Maxiboard panels.

12.5mm fire rated plasterboards are then fixed through the Maxiboard and into the Resilient Bars using 50mm drywall screws.

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Maxi 30 Ceiling - 1/2 Hour Fire Rated Acoustic Ceiling System

Maxi 30 Ceiling

For a half hour fire rating through the ceiling, the 12.5mm fire rated plasterboard is omitted from the previously detailed Maxi 60 ceiling construction and the Resilient Bars need only be installed at 400mm centres with 100mm fibreglass replacing the mineral wool. The Maxiboard panels can be fixed directly to the Resilient Bars using 30mm x 3.9mm SRS Maxi Screws.

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.

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Maxi Dropped Ceiling - installed beneath existing plasterboard ceilings

Maxi dropped ceiling beneath existing plasterboard ceiling

It is also possible to achieve the Building Regulations Part E by installing a Maxiboard ceiling beneath an existing Lath and Plaster or Plasterboard ceiling. Softwood battens are fitted through the existing ceiling, to the joists at 600mm centres. SRS Resilient Bars are then fixed at 90° to the softwood battens, across the full width of ceiling. They are secured at the extremities of the ceiling and at 400mm centres in between, commencing from one edge. 50mm 45kg/m³ mineral fibre slabs are friction fitted between the battens and behind the Resilient Bars.

Maxiboard panels are fixed to the Resilient Bars using 3.9mm x 30mm SRS Maxi Screws. Fixings must be to the Resilient Bars alone and not through into the timber battens. The Maxiboards are secured in a staggered half panel overlap. The shiplap edge is removed where the Maxiboard abuts other surfaces, and SRS Acoustic Sealant is applied to all cut edges. There are to be three screws along each short edge of the Maxiboard panel, positioned 20mm from the edges and at the midpoint. A bead of SRS Gripfix is applied to each panel’s shiplap edge prior to installation.

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.

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Maxiboard - Beam and block floor installation - 1 Hour Fire Rated Acoustic Ceiling System

Prior to grouting, 50mm softwood battens are fitted to the beams at 600mm centres using screw fixings through proprietary ceiling clips. Resilient Bars are fixed at 90° to the softwood battens, across the full width of the ceiling. They are secured at the extremities of the ceiling and at 400mm centres in between, commencing from one edge. 50mm 45kg/m³ mineral wool slabs are friction fitted between the battens and behind the Resilient Bars.

Maxiboard panels are fixed to the Resilient Bars using 30mm x 3.9mm SRS Maxi Screws. The panels are secured in a staggered half panel overlap. The shiplap edge is removed where the Maxiboard abuts other surfaces. SRS Acoustic Sealant is applied to all cut edges. There are to be three screws along each short edge of the Maxiboard panel, positioned 20mm from the edges and at the midpoint.

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

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RSJ Detail

Where an RSJ or similar breaks the ceiling, it is essential that both the Maxiboard and the fire rated plasterboard are continued around the detail, encasing it completely. Timber noggins can be fixed into the recess of the RSJ to enable secure fixing of the boards. The cavity should be filled with mineral fibre.

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Downlighters

Creating holes within the ceiling in order to install downlighters can have a detrimental affect on both the acoustic and fire separation properties of the ceiling, affecting both the upstairs and downstairs neighbours.

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Maxiboard – Other Applications

Maxiboard is perfect for constructing small acoustic housings for noisy machinery and services, or whole room enclosures. The durability of Maxiboard combined with its capacity to take direct fixings makes it simple to use as a basic building board. To add acoustic absorption to enclosures and housings SRS Coustifoam should be applied to the internal surfaces.

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