Sub floor protection?? - Page 2 - Fiberglass RV


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Old 11-19-2011, 08:50 AM   #15
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Originally Posted by Donna D. View Post
Let's make sure we're all talking about the same thing... it will help the archives and Search. Scamp doesn't build a trailer with a "subfloor." It comes with a "floor" that's OBS (?) soaked with resin. If there's a subfloor, it's been put over the top of the original floor by someone other than the Scamp manufacturer.
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And the OSB does show through on the inside. No other flooring... just carpet or lino, or...
Not sure I understand the objection to calling the OSB in a Scamp the subfloor, or how someone could put a subfloor over the top of the original floor since a subfloor is the bottom decking. Using the definition "a subfloor is a rough floor beneath a finished floor" then the OSB is the rough floor and the carpet or lino is the finished floor.

The term "floor" can mean many things. It can mean just the finished flooring like carpet or hardwood, it could be just the decking under the finished flooring, it could include the the finished flooring, decking and framework that holds up the decking, and it can mean everything from the floor framework all the way up to the ceiling (12th floor of a building). In my opinion, using the term subfloor in this thread is the best description of the the OSB beneath the carpet or lino for any future searches of the archives.
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Old 11-19-2011, 11:19 AM   #16
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No objection Andy, I was looking for clarification. In my home, the family room has a concrete floor and carpet flooring over the top. So, I thought finish product that went over a floor was called flooring.

But, I believe in being adaptable and anything that helps Search is a good thing.
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Old 11-20-2011, 09:51 PM   #17
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I'm not a contractor, but I have always considered the "subfloor" to be a layer of material that is laid down over the structural floor soley for the purpose of providing a proper base and interface for the choice of "flooring" or "floor covering", ie: carpet, tile etc. Different types of flooring may require different types of subfloor. Different types of structural floor (concrete, wood) may also require different types of subfloor. The subfloor is an intermediate layer. To me, the Scamp has a "floor". The "flooring" is installed directly onto the floor, and they do not use a subfloor at all. It would be like installing carpet directly over concrete. No subfloor.

Donna's clarification makes sense to me. If she's wrong then we're both wrong

David
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Old 11-20-2011, 11:14 PM   #18
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I'm not a contractor, but I have always considered the "subfloor" to be a layer of material that is laid down over the structural floor soley for the purpose of providing a proper base and interface for the choice of "flooring" or "floor covering", ie: carpet, tile etc. Different types of flooring may require different types of subfloor. Different types of structural floor (concrete, wood) may also require different types of subfloor. The subfloor is an intermediate layer. To me, the Scamp has a "floor". The "flooring" is installed directly onto the floor, and they do not use a subfloor at all. It would be like installing carpet directly over concrete. No subfloor.

Donna's clarification makes sense to me. If she's wrong then we're both wrong

David
The definition of subfloor from dictionary.com is "a subfloor is a rough floor beneath a finished floor". They also define flooring as "one of two or more layers of material composing a floor: rough floor; finish floor." They also define underlayment as "material laid between a subfloor and a finish floor of linoleum, asphalt tile, etc." This seems to be saying that flooring is the finished floor and the part of the floor under the finished floor is the subfloor, and if there is an additional layer in between that is underlayment. That is the way I have always thought of it as well.

The following link at Lowes has a video "Prep a plywood subfloor for hardwood or laminate" in the video at the 1:33 time, it says "Typically subfloors are either concrete or wood".
Plywood and OSB Panels

Typical construction from the bottom up in many houses is 1) floor joists, 2) 3/4" tongue and groove plywood, 3) finished floor material. The subfloor could also be called a structural floor or a rough floor and the finished floor is often called flooring. The finished floor material could be tile, hardwood, carpet, vinyl, etc. The intermediate layer that you pointed out is typically called underlayment, and is sometimes used if the subfloor flexes to much or is not smooth. Maybe different areas of the country use different terms for the same thing.
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Old 11-21-2011, 11:09 AM   #19
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The definition of subfloor from dictionary.com is "a subfloor is a rough floor beneath a finished floor". They also define flooring as "one of two or more layers of material composing a floor: rough floor; finish floor." They also define underlayment as "material laid between a subfloor and a finish floor of linoleum, asphalt tile, etc." This seems to be saying that flooring is the finished floor and the part of the floor under the finished floor is the subfloor, and if there is an additional layer in between that is underlayment. That is the way I have always thought of it as well.

The following link at Lowes has a video "Prep a plywood subfloor for hardwood or laminate" in the video at the 1:33 time, it says "Typically subfloors are either concrete or wood".
Plywood and OSB Panels

Typical construction from the bottom up in many houses is 1) floor joists, 2) 3/4" tongue and groove plywood, 3) finished floor material. The subfloor could also be called a structural floor or a rough floor and the finished floor is often called flooring. The finished floor material could be tile, hardwood, carpet, vinyl, etc. The intermediate layer that you pointed out is typically called underlayment, and is sometimes used if the subfloor flexes to much or is not smooth. Maybe different areas of the country use different terms for the same thing.
Andy,
After doing some searching myself, it appears that it is the industry that is confused . I can find plenty of references to both your scheme and mine. Often subfloor and underlayment are used synonymously. Other places, subfloor is used for the structural floor. If you search Home depot for "subfloor" it takes you to a section called "plywood, sheathing, and subfloor". The subfloor materials listed are clearly for "underlayment". One DIY site talks about using cement board and other materials as "subfloor", and show you how

Sounds like we are trying to know the unknowable. It could very well be that regional differences in contractor lingo have led us here. It is all purely semantic because we all understand the reality.

One question though still remains . If the bottom most layer is "subfloor", the intermediate layer(s) is "underlayment", and the covering is "flooring", then why even have the word "floor" . It appears nobody has one

David
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