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New narrow boards on existing floorboards: nail or float?

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90mm x 18mm pre lacquered pine boards

At 17:56 20/03/2010, you wrote:

Question:
I am laying 90mm x 18mm pre lacquered pine boards over existing floorboards in my hall and wanted to lay in the opposite direction to existing boards. I am a bit confused over the best method of laying, secret nailing or glueing tongue and groove. If I nail as I am going in opposite direction to existing boards I will not be able to nail into joists but understand that the new boards may be too narrow to for gluing. Also can you assist in advising if I should lay an underlay and which type and thickness is best.

Secret nail in existing boards not only on joists

At 12:07 21/03/2010, Wood You Like Ltd wrote:

You are right, the width of your new boards are too narrow to use the standard floating method.
Secret nailing straight onto the existing floorboards (specially in the opposite direction) would work well - you nail the new boards every 20 - 25 cm into the existing floorboards, no real need to end up on a joist, presuming the existing floorboards are in good nick.
If you opt for this method then no underlayment is needed.

Alternatively you could use the self-adhesive underlayment Elastilon onto which the narrow new boards are stuck down.

Elastilon self-adhesive underlayment for wooden floors: the original product

When nailing - which underlayment?

At 14:19 26/03/2010, you wrote:
Hello

This has been extremely helpful. Had not considered self adhesive underlayment will do now.

If I do nail can I use an underlayment. I was considering a 3mm, this to help with noise and eliminating any small imperfections in existing floor.

When nailing - no underlayment!

At 15:42 26/03/2010, Wood You Like Ltd wrote:

Nailing and using underlayment is not really practical: the force and angle of the nail will compress the underlayment and render any effect of sound-insulation useless.
If there are only small imperfections in the floor, the 3mm Elastilon can tackle them - but don't regard it as a "filler".

More of these tips and standard practices etc can be found in our Wooden Floor Installation Manual

Hope this helps

Wooden Floor Installation Manual - everything you need to know about DIY wooden floors

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