| CHECK |
|
WHAT TO DO |
1. Condition of coating, chalking,
eventual superficial discoloration or cracking, especially where
rain can't wash the plate clean.
|
 |
Check if the roof needs any of the
following: washing, cleaning, maintenance painting to prevent
corrosion at the cut edges and a total repaint. |
2. Keeping the rainwater systems
clear. Blockages cause corrosion and may create a danger of
water running inside the building.
|
|
Remove all rubbish with a brush.
Otherwise moisture and corrosion will spread into the roofing
materials. |
| 3. Clean the roof surfaces. Blockages
cause corrosion. |
|
Clean the roof surfaces. Allow the
surface to dry well. |
| 4. Possible damages of colour surfaces
increase the risk of corrosion. The colour surfaces should be
checked in new buildings, too. |
|
Choose the repair or maintenance
painting. In cases where existing coatings are extensively flaky
or there is widespread rusting on the roof, it is often more
economical to replace the roof sheets with new ones. |
| 5. Any metal shavings, fasteners
and other metal objects must be carefully removed as they scratch
the coating and cause corrosion. |
|
Remove all metal shavings and metal
objects. |
| 6. Defective or wrongly installed
fasteners cause leakings and corrosion. |
|
Change all incorrect fasteners. If
the fasteners have been damaged, change for a more durable kind. |
| 7. Corrosion at the cut edges and
the eaves of the steel sheets. Corrosion can spread in the roof
if the roof is not maintenance-painted in time. |
|
Clean the damaged eaves and paint
with a proper type of paint for repainting and repairs. |
|
The fixing and repainting paints are shown in the tables
below:
Maintenance paints for coated steel sheets
| Types of coatings |
Maintenance paint |
| PVDF |
Plaston |
| Pural |
Plaston, Repco |
| Mattapolyesteri |
Repco, Plaston |
| Polyesteri |
Repco, Plaston |
| Plastisol |
Repco, Kirjo Aqua |
|
|
Repainting of old coated steel sheets.
- The coating's adhesion must be carefully checked.
- Remove the old coat which has peeled off.
- Remove all rust.
- Wash the surfaces with Peltipesu or Panssaripesu.
- Rinse carefully.
- Prime pealed-off surfaces with Rostex Super or Galvex
- Paint the top coat 1-2 times.
| PVDF |
Temakeep + Repco |
| Pural |
Repco (*) |
| Mattapolyesteri |
Repco (*) |
| Polyesteri |
Repco (*) |
| Plastisol |
Repco or Aqua |
|
|
(*) Temakeep priming is recommended.
|
