Carpet underlay on stairs query?

[adamfernadam]

Hi all, cant seem to find a definate answer to my question,

My main stairs are i think concrete, or possibly old stone with a levelling compound on, not 100% but id say its concrete...old house.
Each stair has a bullnose front edge protruding out maybe an inch and then an inch down and back to the riser. I have the new carpet grippers in the correct place but my question is....

When im laying the underlay do i just lay it up to the edge i.e a rectangle pad? Or does it lap over the bullnose then fasten back to the riser underneath the bullnose somehow (maybe silicon adhesive or something) ?

Hope that makes sense, thanks in advance, carpet being fitted next week just want to make sure i get it right.

 

[adamfernadam]

anybody any idea?

 

[flooringman]

The underlay should extend from the gripper on the tread over the stair nose and down to the top of the gripper on the riser.

Normally this is fixed with spray adhesive.

A lot of fitters will finish the underlay just over the stair nose but it should really extend all the way down the riser.