Know-how

Glulam

Repair of gluing surfaces

The gluing surfaces on glulam beams can give way either under excessive loads or due to ageing or poor application of the glue. RENOFORS BOIS LAMELLÉ-COLLÉ resins (glulam timber resins) can be reinjected or slats can be reassembled using glass or carbon fibre pins.

This pinning technique allows, among others, to restore crown assemblies that are cracked due to the "constrained" recess.

By restoring the internal cohesion of the beam's structure in this way, shearing stresses between slats are supported perfectly and the bearing capacity is restored.

Increasing the bearing capacity

To increase the inertia of a glulam beam, and thus its bearing capacity, a wood prosthesis can be consolidated with the beam's soffit using RENOFORS BOIS resin (timber resin) and also be linked to the original beam using glass fibre composite rods sealed with resin.

External prosthesis made of treated wood

Rotting effects can often be observed at the bases of glued-laminated bearing arches or columns located outdoors.

The observed cubic decomposition is often due to dry rot fungus: serpula lacrymans, a.k.a. merulius lacrymans. In this case, it is recommended to amputate the structure by sawing off the contaminated part and then replacing it with Class 3 treated wood.

The prosthesis shall be connected to the existing structure by a series of pinning sites sealed with RENOFORS BOIS LAMELLÉ-COLLÉ resin (glulam timber resin) and carried out with composite rods (glass or carbon fibre according to the magnitude of stresses) that are insensitive to climatic changes and corrosion.
A wood preserving coating is then applied onto the restored external parts and a capping, such as a ventilated cap, is mounted to prevent condensation on contact with the timber.

Restoration

The RENOFORS BOIS LAMELLÉ-COLLÉ process (glulam timber process) is used to repair deteriorated structures by:

• - Substituting the altered part using resin mortar and glass fibre rebars, and setting up glued-laminated timber formwork to serve as connection. This technique requires additional work (coating, treatment, capping) and regular maintenance to ensure durability and to be able to guarantee this type of repair.
• - Grafting elements that are in good condition to ensure the structural and architectural continuity of the existing structures