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Reasonable soundproof request or overkill?

6 years ago
last modified: 6 years ago

My husband and I are in the very final stages of buying a leasehold on a ground floor flat. Just before exchange, the freeholder, who lives in the basement flat has requested that the following works specifications be added into the license to assign should we do anything to the floor (this had been something on our must do list):

1. All floorboards screwed down, 2 screws per board per joist.

2. Complete floor surface covered with minimum 15mm sound proofing plasterboard, stapled to floorboards. All internal joints to be caulked with acoustic sealant. Board to be laid with joints perpendicular to the floorboard joints.

3. External boundary of plasterboard to be isolated from existing walls/skirting with acoustic flanking strip of a sufficient height to include subsequent resilient layer and chipboard layers and to fold beneath the final capping bead.

4. Complete floor surface covered with a minimum of 25mm Resilient layer Isover Sound Deadening Floor or equivalent product. Joints to be staggered relative to the plasterboard.

5. Complete floor surface covered with a minimum of 18mm tongue & groove chipboard, all internal joints continuously glued. Joints to be staggered relative to the Resilient Layer.

6. Acoustic flanking strip to be folded over onto the chipboard surface and capped with a bead attached to the wall/skirting but not attached to the chipboard deck.

7. Any and all apertures in this decking for heating pipes or any other items to be caulked with acoustic sealant.

Does this seem like utter overkill? We’re happy to soundproof, but this is an 1890s Victorian and we don’t know what we’ll find when we lift up the floor, both in terms of architecture and heating/plumbing. And is it possible the doors would need to be trimmed with the floor being raised by multiple layers.

Would anyone be able to estimate the cost of these things? (We haven’t found a builder yet)

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