Hello:

I'm installing 1000sq feet of 3 1/4 jatoba hardwood on grade and above grade floors.

The hardwood stores are saying that I should be using red rosin as my underlayment, but I've heard that people are using #15 roofing paper.

Would the red rosin paper do just as well?

thanks,

ryan

If this is a prefinished floor I would stay away from the 15# asphalt paper. I know it is an insudtry standard. However, I have seen problems where you are to overlap the edges of the paper. It is so thick that the overlap can telegraph through the wood flooring leaving ridges where the overlap occurs. An aspahlt impregneted kraft paper is far superior.

like this : www.fortifiber.com/pdf/data_sheets/DS_aquabar_b.pdf

I also will use the Fortifiber "B" paper on some floors. But the way to use 15 lb. asphalt saturated felt on factory finish flooring is to butt the seams instead of overlapping them. Another suggestion I've learned here is to run the asphalt felt at 90 degrees to the floor, instead of the typical parallel method. This way, the flooring is traversing the seams and the overlaps will not show.

For the time being I'm still using #15 felt until the dist. gets in Aquabar B.

After the felt is cut, flip it over first, it will lay much flatter and not pucker. Butt the seams, I use masking tape over them.