External Plastering (Rendering on Metal Lath Using St. Astier Products)
The main difficulty in working on lath is ensuring the lath is suitable for the job. Metal laths come in a wide variety of types and designs, some of which have specific functions and are not suitable for a broad range of rendering applications. It is imperative to check with the manufacturer of the lath what is it designed to cope with. The lath Manufacturers recommendations for fixing should be sought, however as most fixings are specified to accommodate cement renders or plasters, it may be necessary to decrease the centers of the fixings to 4″ (100mm). to reduce to the minimum any movement during application. Laps should be firmly fixed. Lath can be plastic, metal, galvanized or stainless steel. All can be used with NHL mortars. Backgrounds: Application: First coat: use NHL 5 and a well graded sharp sand at a ratio of 1:2. The mortar must be allowed to cure and harden sufficiently, at least 1 week in good weather conditions, longer if possible, before a second coat is applied. Internal work should not be force Further coats can be applied as per the general guidelines for NHL Renders and plasters (2 or 3 coat work). Protection and curing: Note:
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Render on Metal Lath – Guide
04
Sep
Great info!
If I put a finer weave mesh, like polypropylene, or a thinner glass mat, like fiba-fuse, fastened and tensioned behind the steel lath, would a sprayed NHL5/sand mix blot though it?
I’m already using PP mesh behind hand-hurled structo lite to stop product loss with success, but I don’t own a pressure sprayer yet!
Hi Matthew,
Thanks for reaching out! Please email admin@limeworks.us and we will get back to you with a response.