ceiling joist spans Re-generate an old or tired space and give it a fresh breath of life. Click here for answers, information and tips

[fenderman]

Can anyboby tell me the span for 6"x 2" at 8"/ 200mm centres or if they were doubled ie bolted together to be 6"x 4" at 16"/ 400mm centres

[stoneyboy]

fenderman,
There is not straight answer to this question.
If you were to use graded timber (C14) and it was 150x50 at 400mm centres the beams could take a UDL of 75kg/sqm over a 3m span. Your suggestion to double up the timbers and double the centres would make no gain.
end

[Perry525]

It is traditional to increase the thickness of a joist where it will carry the weight of an upstairs fireplace or to double the joists when carrying a upstairs block wall.
What are you trying to do?

[TheDoctor5]

If you type the key words of your question into our search box to the left of the site you may find the answer is already posted or is in the DIY projects section of the website. Every post goes through a monitoring process and using the search box may speed up your answer.