Process
Configurator
Anatomy01/ 07External repairs and insulation
The wall
The brick wall of the building. Before insulating, it is cleaned, old crumbling render is removed and uneven spots are levelled.
- Material
- 25 cm brick in the example
Insulation
INSULATION, LAYER BY LAYER
Facade insulation is a system of seven layers, from the wall to the render. Scroll to see each of them. Below is a calculator for how much less heat the wall loses once it is insulated.
- 3insulation types
- 7layers
- Uwall calculator
Book a site visit
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02/ 07External repairs and insulation
The adhesive
Adhesive around the edge of each board and in a few spots in the middle. That way the board sticks along its whole perimeter and no air moves behind it.
- Method
- perimeter and dabs
- Coverage
- at least 40% of the board
03/ 07External repairs and insulation
The insulation
The boards are laid staggered, like bricks, with no cross joints.
White EPS is light and easy to cut. It is the most common choice for residential buildings.
Graphite reflects radiant heat, so at the same thickness grey EPS insulates better than white.
Wool does not burn and lets vapour through. It is used on taller buildings and around openings.
- Material
- white EPS
- λ
- 0.038 W/mK
- Thickness
- 100 mm in the example
- Material
- EPS with graphite
- λ
- 0.031 W/mK
- Thickness
- 100 mm in the example
- Material
- mineral wool, non-combustible
- λ
- 0.036 W/mK
- Thickness
- 100 mm in the example
04/ 07External repairs and insulation
The anchors
Plastic anchors with a wide head, driven through the insulation into the wall. They hold the boards while the adhesive sets, and later in the wind. How many are needed depends on the height of the building.
- Count
- to the design, 6 per m² in the example
05/ 07External repairs and insulation
The mesh base coat
A base coat with glass-fibre mesh embedded in it. The mesh takes up stresses and keeps the render from cracking. Extra mesh is laid diagonally at the corners of windows.
- Mesh
- glass fibre, alkali-resistant
- Overlap
- 10 cm
06/ 07External repairs and insulation
The primer
A thin layer that evens out how much the base coat absorbs. Without it the render dries unevenly and goes blotchy.
- Colour
- tinted to the render
07/ 07External repairs and insulation
The decorative render
The last layer. It gives the facade its colour and texture and protects it from rain and sun.
- Type
- silicone or silicate
- Grain
- 1.5 to 2 mm
Whole system
The whole system
Seven layers, and from outside only the render shows. Change the insulation at the top right or in the calculator below: the two are linked.
To the calculator
What is included
WHAT WE DO OUTSIDE
01
Facade insulation
EPS, graphite EPS or mineral wool, with the whole system up to the render.
02
Facade render and paint
New render on an old base, or repainting an existing facade.
03
Balcony and terrace repairs
Floors, railings, waterproofing and drainage on balconies and terraces.
04
Replacing flashings and gutters
Flashings on eaves, chimneys and sills, gutters and downpipes.
Calculator
HOW MUCH HEAT INSULATION SAVES
Choose the wall and the insulation. The calculator gives the thermal transmittance U before and after insulation. The lower the U, the less heat passes through the wall.
Less heat lost through the wall…%
- U without insulation
- … W/m²K
- U with insulation
- … W/m²K
The calculation is for 1 m² of wall, with typical thermal conductivity values and plaster on both sides. The energy performance design gives the exact values for the building. The calculation is approximate and is not a quote.
How it goes
HOW IT GOES
- 01
Site visit
We look at the walls, the windows and the balconies. We measure to work out the area.
- 02
Preparation
Scaffolding, cleaning the walls, removing loose material, levelling.
- 03
Insulation
Adhesive, boards, anchors, in that order. Around windows the boards are cut so that the joints do not run into the corners.
- 04
Base coat
A base coat with mesh over the whole facade, with extra pieces at the corners of openings.
- 05
Render
Primer and decorative render in the chosen colour.
- 06
Handover
We take down the scaffolding, clean up and walk round the facade together.
See also
MORE ON THE TOPIC
Questions
COMMON QUESTIONS
It depends on the wall and on the goal. The calculator above shows how U falls as the thickness grows; the energy performance design says how much your building needs.
EPS is lighter and cheaper. Wool does not burn and lets vapour through. Taller buildings and the areas around openings often call for wool.
The adhesive and the renders need temperatures above 5 °C, day and night. In cold weather the work is planned for the warmer months.
Above one storey, yes. The quote says whether scaffolding is included.
Site visit
LET US SEE YOUR SITE
We come to the site, anywhere in Bulgaria. The price and the timeline follow the visit, in writing.
Book a site visit
or call 0884 420 445