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.
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.jpgMany 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: 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
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
3. Using sharp tools
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. Tie our waists to the chimney for protection
2. Wear correct PPE
3. Wearing PPE and we put tape around the blade to act as another layer
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 wont take us more then a day or two to put right.
Method statement:
We will use a ladder to climb onto the roof of your property, we will have to tie some rope around our wastes and to the chimney in case for any reason we slip we are secured to something stable. 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.
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
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 £156
Thank you very much for picking Crookes Crooked Construction & Co.
Hey you just nailed it with your article regarding slate roofing. I needed this information and searching for it for very long. Recently i get the service from Aintree Roofing Services LTD for my slate roof and for other roof repairs Merseyside work. You can also go with there service. They are awesome.
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