LVL Handbook EUROPE

2. LVL STRUCTURES IN FLOORS, WALLS, ROOFS AND IN SPECIAL APPLICATIONS

Figure 2.54.

Large LVL I-beams as main beams of a warehouse roof

structure at Herttoniemi, Helsinki, Finland.

Metsä Wood

2.3.8 Roof renovation applications

In the renovation of residential buildings, nail plate truss roof

structures can be converted to room-in-the-roof attics by re-

inforcing or replacing the top and bottom cords with LVL-P

beams and removing the truss diagonals. LVL-C or plywood

connection plates are nailed or screwed to the corners to build

a new rigid frame structure. The economical span range for the

solution is 8-10 m depending on snow loads and thermal insu-

lation requirements. It is recommended to leave at least a 100

mm ventilation gap between the thermal insulation and roof

covering. The building physics design must, however, be done

project-specifically based on national requirements.

Figure 2.55.

Conversion of nail plate truss structure to room-in-roof attic. Top and bottom cords have been reinforced with LVL-P beams and

truss diagonals removed. LVL-C or plywood is used for the frame corner connections.

Metsä Wood

LVL Handbook Europe