Can I lay engineered wood on floor joists?

Yes, you can lay engineered wood directly on floor joists, but only if the flooring is at least 18mm thick. Additionally, the boards need to be fixed lengths for proper support. This ensures the flooring has the stability and durability needed when there is no subfloor underneath.

Here are some key points to consider:

1. Thickness and Stability:
The engineered wood should be thick enough (generally at least 18mm) to provide the necessary strength and stability when laid directly onto joists. Thinner engineered boards might not offer enough support and could lead to a bouncy floor.
2. Joist Spacing:
The spacing between your floor joists is crucial. Ideally, they should be no more than 400mm apart to ensure the floor remains stable and doesn’t flex or creak. If your joists are further apart, you may need to add additional supports.
3. Installation Method:
The boards can be either nailed or screwed directly to the joists. It’s essential to ensure that each board is securely fastened to avoid movement and squeaking. Tongue-and-groove engineered wood is often a good choice for this type of installation because it helps the boards interlock securely.
4. Moisture Considerations:
Make sure the area below the floor joists is adequately ventilated to prevent moisture build-up, which could warp the wood over time. If you're installing over an unheated space like a basement or crawl space, you might want to consider adding a vapour barrier to protect the wood from moisture.
5. Underlay and Insulation:
While underlay isn’t usually necessary when laying directly on joists, you might consider adding insulation between the joists for better energy efficiency and soundproofing.
Installing engineered wood directly onto floor joists can be a great way to achieve a solid, long-lasting floor. Just check your specific product’s installation guidelines and, if in doubt, consult a professional to ensure the best results.