Issue with sunken floorboard

[Diybeginner5]

Have just moved into a house where one of the floorboards isn't supported properly because of central heating pipes being where the board support should be.

I have attached a photo to show the problem. Is the best solution to replace both boards with ply ?

Any help very much appreciated !

 

[John D v2.0]

I've got around similar situations by screwing a metal plate strip to the back of the two boards, or screwing some wood to the side of the joists where possible. I think the first option is the only one that would work for you.
Plywood would probably be better on the whole, but to be honest a floor isn't high tech so any way is fine.

 

[Nozzle]

Age old favourite of plumbing through the second most "important" area of the joist! Seems convenient for the plumber at the time, but its taking meat out of the top chord, grrrr! John D 2.0's idea would work as a solution to the sagging board though. You could use something like 1 or 2 mm steel then cut (chisel/route) a corresponding shallow slot on the underside of the board - it doesn't even have to be on every joist, perhaps every other one (it might creak though).

Nozzle

 

[big-all]

has the tongue been removed from the longer length ??