Defects
of slate roofing
Staining on roofing slates: Slate edges showing moisture
absorption, but generally good condition, these slates have a good remaining
life http://inspectapedia.com/roof/slate35.jpg
White Efflorescence on roofing slates: the white markings
shown on these roofing slates, is a mineral deposit left behind as water
evaporates. Water penetrating the slate material absorbs minerals and leaves
some of them, probably Ca and Mg on the slate surface.http://inspectapedia.com/roof/Slate_Effloresence020DJFs.jpg
Many slate roofers and slate inspectors assert that as the white stains progress from the edges of individual slates towards their centre, one can estimate the remaining roof life. If 50% of the slate remains inside of the white area, the slate may have about half of its life remaining.
We recommend that this condition be confirmed by close inspection as well since other slate deterioration factors could be at work.
Many slate roofers and slate inspectors assert that as the white stains progress from the edges of individual slates towards their centre, one can estimate the remaining roof life. If 50% of the slate remains inside of the white area, the slate may have about half of its life remaining.
We recommend that this condition be confirmed by close inspection as well since other slate deterioration factors could be at work.
Mineral inclusions, holes in slates - the slates with these defects need to be replaced or patched from below with copper panels.http://inspectapedia.com/roof/slate26.jpg
Mineral inclusions: Slates with mineral inclusions, the wash-out of minerals in some slates can lead to holes and leaks http://inspectapedia.com/roof/slate23.jpg
Names of common
materials
Welsh slate roof tiles
Led for hooking tiles into place
Possible defects in
materials
Mineral inclusions: Slates with mineral
inclusions, the wash-out of minerals in some slates can lead to holes and leaks
Holding led for too long can lead to poisoning
Tools,
power tools, and materials.
Materials
Slate tiles
Lead
Galvanised clout 40mm 400g nails
Tools
Hammer
Hack saw blade
Ladder
Risk Assessment
Place: Milton Keynes
22 Midsummer Boulevard
MK9 2AJ
Date: 17/09/12
Activity: Repairing slate roof
Risk Assessment Done By: Crookes Crooked Construction &
Co.
Hazard
identified:
1.
Working at heights
2.
Working with hazardous substances/materials
such as lead
3.
Using sharp tools such as hacksaw blades
Who might
be harmed:
1.
The
people working at heights and anyone below them
2.
The people working with the materials
3.
The people using the sharp tools
Risk
level:
1.
High
2.
Medium
3.
Low
Control
measured required:
1.
We will put up scaffolding providing a
working platform to the property which will provide protection to the general
public as well in accordance to height regulations
2.
Wear correct PPE such as safety gloves to
stop skin irritation
3.
Wearing PPE and we put tape around the blade
to act as another layer
Method statement:
We will put up a scaffolding to gain access onto the roof of
your property, we will have to make sure it complies with the working at height
regulations and that it is accordance with PUWER regulations too. We will use
two wedges, one either side of the tile to prop the others up and using a
hacksaw blade cut the nail holding the tile in so the tile slides out, we will
then nail a strip of lead onto the roof and slide the new tile into place, we
will then bend the lead over the tile and nail it in to hold the tile and stop
it sliding down, we will do this for all of the tiles and make sure they are
secure and tight.
Quote.
Mr Harwood
Milton Keynes
22 Midsummer Boulevard
MK9 2AJ
After my trip to your property I have assessed what needs
doing and have attached a quote, the tools we will supply. We will need is the
money for the materials up front and the labour charge can be paid once the job
is completed to your satisfaction. This will be a very easy job as only a few
tiles are damaged and it won’t take us more then a day or two to put right.
Materials:
4 slate tiles £3
Box of galvanised clout 40mm 400g nails £3
Lead (I have some lead and will cut strips of it to use to
save you buying a new roll) £10
Scaffolding £200
Labour costs:
2x labourers £50 daily rate £100
Travelling costs:
Company van/ petrol costs: £40 for 1 day.
Total pricing for job:
Travelling: shipping: labour: P+P: Total £356
Thank you very much for picking Crookes Crooked Construction
& Co.
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