Whether you attempt to do the
work yourself, or hire a contractor, you need to understand the process so that
you can plan it around the rest of your project.
1.
PREPARING THE WALLS
Before
a building is rendered, the walls should be surveyed, with repairs made to structural defects and
any movement stabilised, otherwise the render finish is likely to fail. Any new
finish is only as good as the wall behind it.
2.
EXTERNAL DETAILS
External details such as bargeboards will often have to be
removed, along with rainwater and soil pipes and other external details such as
alarm boxes. Any vents will need to be extended, and sometimes window sills
must be extended too. Metal stop and angle beads are then applied around the
window and door openings and corners (or the edges of a terraced property) to
provide clean edges for the render. The render system can then be applied.
3. INSULATION
Where external wall insulation is being applied before the
render coat, this is usually in the form of rigid boards or slabs. The type of
fixing needs to be selected depending on the type of wall — which is either
mechanically fixed or glued to the walls.
4. CREATING A
FOUNDATION FOR THE RENDER TO FIX TO
A fabric render mesh is then applied over the insulation, bedded
into the first base coat layer of render. This mesh acts as a reinforcement
against cracking. This is followed by one or two more thin coats of render,
usually a primer and a topcoat.
5.
BUILDING UP THE RENDER
Different proprietary systems are built up of different layers,
using various forms of insulation, including expanded polystyrene (EPS),
mineral fibre (Rock Fibre) and phenolic foam (more expensive but superior
performance). Different types of render are also used with external wall
insulation systems, depending on the application and the desired finish,
including polymer cement, silicone and acrylic.
6.
RENDER FINISHES
Thin
coat render systems are designed to be self-coloured so that they don’t need painting. As
well as a choice of colours, different finishes are also available, from very
smooth to textured. If you have chosen rendering that needs painting, make sure
you choose a weatherproof external paint.
Sandtex Ultra
Smooth Masonry Paint in Pure Brilliant White, from £20 for 2.5L, used on this
porch, is ideal for painting rendered surfaces as well as pebbledash, concrete
and brickwork and if white’s not right for your home, there are 26 colours,
too. The door is painted in Sandtex Exterior 10 Year Satin Paint in Seclusion,
from £22 for 750ml.
(Image
credit: Sandtex)
7.
FINAL FINISHES
Finally, the external rainwater and soil pipes etc. can be
reapplied. You can expect the total process to take around three to four weeks.
To learn more about the Rendering
service in Brentwood we offer, please
contact with us . We look forward to hearing from you soon!
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