Glulam — Engineered Beam Uses and Structural Repair

A glulam is a glued laminated timber beam made from multiple wood laminations bonded together to form a strong engineered structural member.

What It Is

Glulam beams are manufactured by stacking and gluing dimension lumber laminations so the finished member can span farther and carry more load than a comparable sawn timber. They are engineered products, not just thicker boards nailed together.

Because the laminations can be arranged for strength and appearance, glulams are used where both structure and finished aesthetics matter. They often remain exposed in vaulted rooms, porches, and large openings.

Types

Common types include straight glulam beams, curved glulam members, stock beams for residential headers, and custom large-span members for decks, roofs, and commercial structures. Appearance grades vary for exposed and concealed use.

Where It Is Used

Glulam is used for long-span headers, ridge beams, porch beams, deck beams, floor girders, and exposed roof structures. It is common where ordinary sawn lumber would be too weak or too deep for the opening.

How to Identify One

Look for a large wood beam with visible horizontal laminations bonded together across its depth. Manufacturer stamps, engineered sizing, and a cleaner, more uniform appearance than rough-sawn timbers are typical clues.

Replacement

Replacement is needed when a glulam has severe rot, delamination, fire damage, notching beyond design limits, or structural overstress. Because it is a load-bearing member, repairs and replacement should follow an engineered plan.