Merronbrook Engineered Wood Products

Merronbrook are specialists in engineered wood products (EWP) and manufacture timber frame components, open web joists and roof trusses.

This illustration combines two popular construction methods. On the left, a traditional block and brick construction and, on the right, timber frame wall panels with a brick outer skin. The ground floor is a poured concrete slab and open metal web joists form the first floor.

A typical timber framed two-storey dwelling.

Eaves

Once the first-floor panels are positioned, a head-binder is used to connect the panels together. Roof trusses are positioned at 400mm or 600mm centres.

Floor Edge

A head-binder connects the first-floor panels and the floor system is installed on these wall supports and the floor edge is completed by a rim board.

Sole Plate

Timber frame panels are seated on a single sole plate, fixed through the DPC to a masonry “kerb” built off the regular “block & beam” foundation.

Flat Roof

Open metal web joists allow the easy installation of roof lights. Note that the joist is doubled on each side of the opening with timber trimmers at each end.

Joists are shown supported on masonry hangers, built into the clockwork and built through the block and brickwork to create a soffit detail.

Roof Trusses

From back to front: attic truss, fink truss, hip truss and mono truss.

Attic Truss

Attic trusses can provide additional living space within the roof zone. Double joists and binders reinforce the opening for the stairs and double rafters and trimmers form the openings for a skylight and dormer window.

Hip Roof Truss

With a gable end and roof ladder.

Mono trusses sit in truss hangers, these are fixed along the bottom chord at the appropriate centres.

Truss clips are used to fix a single truss to the wall-plate at the appropriate centres.

At the end of the load bearing blockwork wall, a timber wall plate is fixed down and secured with long wall-plate straps at generally 2000mm centres.

At a gable-end, trusses are linked to the gable end wall using gable restraint straps.

Room-in-a-Roof

The room-in-a-roof structure using open metal web rafters allows for an open plan layout, which traditional roof trusses may not allow.

Open Metal Web Joists

Open metal web joists have numerous benefits, including greater spans and accommodating many services routes, and can be incorporated into traditional brick and block structures, or timber frame buildings.

Bottom Chord Support Built In