Hi Jay,

Thank you for your question.

I really do think you should refer your question to Sleepmasters to ensure it does not affect any future warranty issue.

As mentioned in a previous comment you do need to ensure the slats are not too firm to cause a hump each side of the mattress.

Good practice is to use a couple of thin mdf sheets (2' x 3') to bridge the two humps together, creating a more level platform for your mattress.  Please see an article here from our website which explains how this should be done and the reasons why.

I would also place an old topper or blanket on top of this to add further cushioning for the mattress.

Hope this helps but please do not hesitate to contact our office on 0161 437 4419 for further information or advice.

Kind regards Julie