Rendering / Plastering

[dmsjps]

Hi, we've just constructed a conservatory between 3 walls, 2 of which are smooth brick and the other is very rough, old, uneven brick with 'botched' bits in between. We'll have to render the 'old' wall before plastering, but can we plaster straight over the other 2 walls or should we render them first? Thanks.

[boobesque]

they should all be rendered before plastering im afraid, its never a good idea to plaster straight on to brick as it doesnt bond well.

[topman9thnov]

the easy way would would be to use plasterboards,using the dot and dab method.

[zmudge]

For the first application on both your smooth and rough walls there are many plaster bonding agents available. If you are using Thistle plaster go to the british-gypsum website for details of their (excellent) bonder. Otherwise Google Plaster Bonding Agents to find a choice of many. Terminology in plastering is Render = 1st coat, Float = 2nd coat and Set = 3rd coat. For your smooth walls apply bonding agent then Render and Set. For your rough wall apply bonding agent then Render and Float (to straighten it up) then Set.

With compliments zmudge