Underlay and asphalt floor

I hope one of you experienced flooring layers will be willing to give me some advice.
I have an old house with an asphalt layer covering the floor. This is flat and smooth and has the old type of underlay on it at present. I am going to install new foam underlay and carpet and was wondering if the Asphalt floor will react to the foam underlay and so would it need a lining paper layer between the two. Also as stapling the underlay down is not an option does it need fixing in place or will it be ok ?

 

Use carpet spray mate.

 

Carpet spray as other fella says

 

Thanks guys but does it need paper to go between the foam underlay and the asphalt or does thew asphalt not react with the foam underlay ?

 

There’s no harm in using a lining paper but you will have to leave space to fix the underlay or fix the paper in the same areas as the underlay. I’ve never seen a pu underlay react with a asphalt floor.


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