Often (when it is viable to do so), plasterers will recommend overboarding such surfaces (particularly ceilings), as this can both reduce costs and risks to both the craftsperson and customer. This is the method preferred, and used by most. Instead of using plasterboard as outlined above you can also use a galvanised mesh called Expanded Metal Lathing, or EML for short and simply nail this between the studs, keeping it a tight as possible and plastering over the top. Then the surface needs to be prime coated to control suction, which is achieved using either PVA or SBR and water solution, or a suitable PVA grit. Using EML Instead Of Plasterboard To Repair Lath And Plaster. Ideally, the walls would be keyed by scratching with a scraper, a nail, or a float with embedded nails. If any part of the surface has become 'live' (or has debonded from the lath) these sections would need to be carefully repaired, by removing affected areas then patching - using bonding coat, or plasterboard, or sometimes both. Once you have cut back the laths and plaster, you can then place a section of plasterboard in the hole and fix it with galvanised plasterboard nails. The odd superficial crack is fine provided these are raked out slightly and bridged over with fibre tape (aka scrim). The walls/ceilings would need to be in reasonably sound condition and adequately prepared. However, there are a few things to consider: Most importantly is it’s ability to absorb noise and deter the spread of fire. Yes, existing lath and plaster can be skimmed over. There are actually many advantages to a plaster and lath construction.
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