9 Common Signs of Subfloor Damage
Your floors are uneven or sunken in parts. Your floorboards squeak – loudly. The room smells musty. Your floors shift or bounce when you walk on them. Your toilet is rocking or loose. Your tile flooring has cracked. Your hardwood floor is cupping. Your linoleum floor is bubbling up.

Can you replace pieces of subfloor?

If the water damage has been occurring for a while and there are signs of flaking wood or mold, the only option may be to replace the affected section of subflooring. Start by removing the finished floor (hardwood flooring may be reusable once it dries, so be careful in the removal process) and exposing the subfloor.

How do I fill the gaps in my subfloor?

How to fix large gaps in the subfloor
Move the floorboards. Some people will tell you to stack the floorboards as close to each other as possible when you lay down your subfloor layer. Use fillers. Use strips of wood or other materials. Replace floorboards.

What is underneath a subfloor?

Underlayment

The underlayment material is installed below the floor covering and placed on top of a subfloor. Under the visible covering, there is a layer made of soft or foam-like materials with a thickness of between 1/4 – 1/2-inch.

How do you replace a rotted floor?

Here are the steps to replace a rotted bathroom floor:
Close the water valves.Prepare the room.Inspect the areas that need replacement.Remove the flooring.Inspect the subfloor.Inspect the joists.Replace or reinforce joists.Replace the subfloor.

Can you put new plywood over old subfloor?

Underlayment can also help protect the finished flooring from moisture, mold, and mildew. Plywood is a great underlayment to install over a subfloor. It is strong and durable and often very smooth without a lot of imperfections or knots.

Is it better to use OSB or plywood for subfloor?

The National Tile Contractors Association and the Resilient Floor Covering Institute both recommend plywood for subflooring and underlayment, because it doesn’t have the risk of swollen edges that OSB does. Plywood also has a slight advantage in stiffness, which means that subflooring panels need not be quite as thick.

Do I have to replace water damaged subfloor?

Does a wet subfloor need to be replaced? No. If you can begin the drying process immediately after the initial water damage, you may be able to avoid subfloor replacement. It’s best to let restoration professionals address the existing damage.

Does subfloor go under walls?

A subfloor is the solid base underneath the floor covering that you depend on for the stability of both the floor and walls in a room. Though it’s not the main support system—that’s the work of beams, posts, and joists—it does its fair share of the work.

How do I know if my floor joists are bad?

Telltale Signs of Damaged Floor Joists
Moist, rotting wood.Skewed or unlevel door and window frames.Sagging, sloping, or uneven upstairs floors.Tilting or sinking crawl space supports.Cracks in the interior drywall.

What goes on top of subfloor?

Underlayment: Some types of flooring can be installed directly on top of the subfloor, such as vinyl flooring. Other types need a middle layer, called underlayment, such as laminate,carpet and tile.

Is it OK to have gaps in subfloor?

1. Improper spacing. To avoid buckling, subfloor panels should be spaced with a 1/8-inch gap at all edges and ends to provide room for naturally occurring expansion.

What do you use to fill gaps in plywood subfloor?

Large gaps can be filled by rearranging the floors. It’s possible to fill the holes in the subfloor with cement-based fillers or caulk. Wood strips, wood shims, and ropes can be used as flooring gap fillers.

Can you use wood filler on subfloor?

You can simply use a putty type of wood filler. Or anything to prevent the laminate from dipping. I’ve seen guys use construction adhesive like PL to repair small defects in the subfloor.

Can you use subfloor as your floor?

Concrete subflooring is acceptable as regular flooring, as long as it’s in a moisture-proof environment. Consider the long-term effects of leaving your subflooring exposed.

What are 3 common subfloor materials?

Common Subfloor Materials. There are four primary materials used as subfloor: plywood, oriented strand board (OSB), concrete, and high-performance panels. There are other subfloors materials out there, but they are used in more niche situations.

What thickness should subfloor be?

The minimum thickness of plywood for subflooring is about 5/8 inch. Since it does not hold fasteners as well as plywood, OSB must be a little thicker, or at least 23/32 inch. There are several factors that determine what subfloor thickness is optimal for added benefits like insulation.