Can I used planed timber for floor joists?

loveisdivine

I have a thread elsewhere about replacing my rotten floor joists. But I just have a quick question that and thought I might get a quicker reply here.

I need 4 1/2 in x 1 1/2 in timber for the joists. It's only a very small room so spans are fine. I can't go any bigger otherwise with floor boards, underlay and top flooring I won't have enough space.

Most timber places I've checked are out of stock of C16 treated timber in this size, 1 place is offering me the right size in planed timber.

It's more expensive but is that the only difference? Can I use it for the floor joists? Obviously it's a waste having "pretty" wood where you can't see it, but I need this exact size.

Calahonda52

Planed yes but is it graded/treated?

my3cents

If the joists are that short surely it would be easy enough to cut down whatever you can get thats the right grade.

SC024

how tight for space are you ? are you redoing the whole floor? 5 x 2 comes at 4 3/4 strong by 1 3/4s . If you were doing the whole floor would it make a huge difference? depending on finshes etc.