Advantages of the Mariseal 250 roofing system:
- No embedment materials, so laying is quicker and easier
- Highly flexible
- Can be built up to take tiles laid directly over
- Flat roofs will have no joints or seams when finished
- 10, 15, 20 and 25 year guarantees available on built up system
Disadvantages of the Mariseal 250 roofing system:
- Quite smelly when being laid
- Needs relatively good weather to lay
- Temperature has to be above 5ºC
Mariseal 250 roofing system test box
Take a look at this video of a box I made in the workshop.
Using the Mariseal 250 roofing system I formed a box that I could use to demonstrate how flexible the system really is.
Mariseal 250 roofing system used to encapsulate parapet walls
In this video I use the Mariseal 250 roofing system to encapsulate the parapet walls after some repair work was undertaken.
Water penetration though parapet walls is becoming a big problem with the sustained amount of rain we are having currently. The old brickwork we have in London, and the UK in general, is becoming more and more porous and encapsulation is just one of the ways we now deal with this problem.
Mariseal 250 roofing system used to form a box gutter
In this video I use the Mariseal 250 roofing system to form a new box gutter around the edge of this slate roof.
The old asphalt box gutter was in a poor state of repair and the cost to completely strip it out would have been astronomical, after a consultation with the customer and the architect it was decided to overlay the box gutter with the Mariseal 250 roofing system.
The main cost of overlaying a box gutter is taken up in accessing, accommodating and preparing the works area.
- Accessing: We need to assess ways of accessing the area, e.g. whether or not we need scaffolding. We also need to know if we can can work on the box gutter when it’s covered with our liquid roofing system.
- Accommodating: This is what we have to do to the surrounding areas of the roof to allow us to conduct our works, e.g. remove tiles and slates, and possibly re-fix afterwards.
- Preparation: We need to clean the box gutter and make sure that the substrate is sound and clean for maximum, efficient adherence. If you look at this closely the only difference with overlaying the roof and completely replacing it is that we don’t take the old roof covering out. So why not? If we did remove it, we would have the additional work of doing so, the additional cost of disposing of the rubbish and the biggest factor of all, which is the time it takes. The time factor is of paramount importance because whilst the roof is in pieces, there is always a chance that it may rain and consequently the rooms below will suffer from water damage. Basically if an overlay system such as the Mariseal 250 Roofing System can be used without jeopardising the longevity of the works, then there is no reason not to go for an overlay system.
Let’s look at your options if you want to replace an old roof:
Option 1: Stripping
Strip the roof of the old covering and replace with a new covering.
Now, if you start to strip the roof, all sorts of other options open up:
- Should I have a temporary roof put up over the old roof to protect the building?
- How do I get all the old materials off the roof?
- What is the cost of dumping the rubbish?
- What is the cost of stripping the roof?
- Stripping the roof will trigger part L1B of the building regulations, and I will have to insulate the roof.
Option 2: Overlaying
- No need for a temporary flat roof over the top as the roof will not be opened up.
- No need for insulation.
- Only remove the old stones and prepare the surface of the old flat roof ready for overlaying.
- Overlay the roof using the Mariseal 250 roofing system.
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