How To Install Attic Flooring, by Lowe's Home Improvement on YouTube. 13 min 41 s.
- Video length
- 13 min 41 s
- Time to do it
- 1 day
- Difficulty
- Medium
- Steps
- 8
What you need
Steps
Measure your attic access opening and the usable floor area. Note the joist spacing and direction so you can plan panel layout and how you will get sheets up there.
Check the joists for size, spacing and any damage. For heavy storage, add blocking or extra support where the span is long or the framing looks weak.
Seal gaps around wires, pipes and top plates with spray foam and silicone caulk. This keeps the insulation R-value up and cuts air leakage before you cover the framing.
Plan insulation so it stays in place under the new floor. Do not compress insulation, and keep vents and soffit airflow clear.
Cut the first panel to fit at the access point. Run the tongue edge toward the next panel and leave a small gap at the edges for movement.
Apply construction adhesive to the joists, set the panel down and fasten it with a framing nailer or screws through the joists.
Fit the next panels by tapping the tongue into the groove. Stagger the joints and fasten each panel the same way.
Finish the edges and access opening with trimmed boards. Sweep the floor and check that no wires or vents are pinched.
Tips and common mistakes
Never step on the bare ceiling between joists, only on solid framing or laid panels.
Wear a dust mask and eye protection, since attic insulation and old dust are irritating.
Keep stored items light and spread the weight evenly across several joists.
Leave a clear path to the access hatch and do not block vents.
Questions
Can I put flooring directly on the joists?
Yes, if the joists can carry the load and you air seal and keep insulation in place first. For heavy storage, add support or consult a professional.
What thickness of panel should I use?
The video uses ¾ inch tongue and groove OSB, which gives a sturdy walking and storage surface over standard joist spacing.
Will flooring over insulation hurt energy efficiency?
It can if you compress insulation or block airflow. Air seal first and keep the insulation full thickness under the panels.
This guide was drafted from the video's details and general task knowledge. It has not been checked against the full video. Check the video and relevant product instructions before following a procedure. Report a correction.
