name of wood

[edsmith38]

What do they call the wood backing on a rain gutter,that holds the gutter to the house.

[jake-the-peg]

Often referred to as soffits but this isn't strictly correct as that's trhe underside (parallel to the ground)

http://doityourself.com/roofing/rfsoffits.htm

[gazzawazza]

It's the fascia board.

[sddsddean]

Agree with gazza. Also sometimes called a bargeboard (though I've no idea why!)

[gazzawazza]

I haven't checked these terms in a dictionary, but during my apprenticeship I was taught that the fascia is the one you're referring to, the soffit is as jake-the-peg described it and the bargeboard is usually the vertical timber which goes up the side of the roof at the gable end (or at a gradient.)