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Old 08-02-2019, 02:14 PM   #1
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2x8 in basement. What is the legal floor joist in ceiling if converting attic to a room? Id assume all western countries have relatively the same requirements

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Old 08-02-2019, 02:30 PM   #2
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Re: Legal joist size


Where are you located? Fill out your profile. What is the span of the 2x8, unsupported. Many attic spaces are not meant to be expanded into. We could use pictures so we could see what you see.
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Old 08-02-2019, 05:29 PM   #3
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Re: Legal joist size


https://beta.photobucket.com/u/reall...f-f0fd96a86075

Im surprised that link works. The new beta photo bucket has us snookered. Anyway, floor joist from support wall to centre beam is 11, 2" and joists are 18" apart. I haven't gone up into the attic yet.

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Old 08-02-2019, 05:37 PM   #4
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Re: Legal joist size


Out here we build with 2x10 or more but in many places they check a span table and do closer to the size that is enough to span the area..
So if you have 2x8s on the main floor another floor may well get away with that.
What are you thinking of building. Anything with a permit will need plans and they will be subject for approval for things like general construction of the building, the foundation, little details like that.
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Old 08-02-2019, 05:48 PM   #5
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Re: Legal joist size


Opps, I tried to sneak that additional info in there b4 anyone replied that. Anyway, I was thinking on creating an additional bedroom. I believe legally 7, 3" height is required at the centre. I didn't measure that either, but it should met it. Would I need a permit with plans for this? Or just some generic permit?

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Old 08-02-2019, 05:55 PM   #6
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Re: Legal joist size


In other words, I haven't checked the ceiling joists measurements
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Old 08-02-2019, 06:03 PM   #7
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Re: Legal joist size


You would have to what you have, trusses makes it much harder. but you need to add structure for stairs, wiring, window of a certain size, insulation, it gets involved.
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Old 08-02-2019, 06:05 PM   #8
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Re: Legal joist size


Quote:
Originally Posted by reallylongnickn View Post
In other words, I haven't checked the ceiling joists measurements
A picture of the attic will help, the size and lay out of the ceiling joists, the size of the rafters.
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Old 08-02-2019, 09:03 PM   #9
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Re: Legal joist size


No such thing as a "generic permit" that I have ever heard of. Your intent is to turn a non-living space into a living or interior space. As mentioned, in addition to joist capacity, you will have to satisfy other living space features such as access, HVAC, electrical, windows, etc along with maintaining roof support. Another thing to consider is the impact on ventilation in the remaining attic space.
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Old 08-02-2019, 09:15 PM   #10
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Re: Legal joist size


3 pics

https://beta.photobucket.com/u/reall...7-f4feae4f7ece

https://beta.photobucket.com/u/reall...7-4ea99812092e

https://beta.photobucket.com/u/reall...8-2083adf6221d
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Old 08-03-2019, 06:47 AM   #11
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Re: Legal joist size


It looks very spacious. None of the pictures, however, show any of the joists that you will be using for your floor. Are there any supporting walls under the attic? What is the longest unsupported span? The main concern is the ceiling joists. We need to know how they are constructed and what they are composed of.

In addition, it is a small cost considering what you are doing, but investing in the services of a structural engineer will vastly help your decision making. I am certain you have already figured out how you will access this area with a staircase.
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Old 08-03-2019, 07:21 AM   #12
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Re: Legal joist size


The bucket at the roof is cute but each should have it's own vent.

for a straight run stair case you will need 3 ft x 14 ft 6 in. if you ceiling height is 8 ft.

Or for split stairs with a landing you need 106"x 76"
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Old 08-03-2019, 11:20 AM   #13
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Re: Legal joist size


Quote:
Originally Posted by chandler48 View Post
It looks very spacious. None of the pictures, however, show any of the joists that you will be using for your floor. Are there any supporting walls under the attic? What is the longest unsupported span? The main concern is the ceiling joists. We need to know how they are constructed and what they are composed of.

In addition, it is a small cost considering what you are doing, but investing in the services of a structural engineer will vastly help your decision making. I am certain you have already figured out how you will access this area with a staircase.
It'll have to wait until middle next week for me to get those details- I'm away from home.
For stairs, I was thinking on those metal prefab ones. Since the house is 894 sq ft, this would save space.

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Old 08-03-2019, 11:35 AM   #14
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Re: Legal joist size


Quote:
Originally Posted by reallylongnickn View Post
It'll have to wait until middle next week for me to get those details- I'm away from home.
For stairs, I was thinking on those metal prefab ones. Since the house is 894 sq ft, this would save space.

I appreciate the feedback I receive from people at this website.
Stairs have to meet code. 2 bedroom house?
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Last edited by Nealtw; 08-03-2019 at 11:38 AM.
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Old 08-03-2019, 11:44 AM   #15
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Re: Legal joist size


2 bedroom on ground floor yes.
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