BLM Rolled Lead Sheet

BLM ROLLED LEAD SHEET

BLM’s rolled lead sheet is manufactured to British Standard BS EN 12588 and made from 100% recycled raw material.

The British Standard ensures the alloy used contains a minimum amount of lead and the correct amount of trace elements. It also guarantees a consistent thickness (+/- 5%) and grain structure, so its performance can be accurately predicted to provide maximum lifespan for correctly fitted lead sheet used in construction.

BLM supply rolled lead sheet in any width from 150mm to 1580mm in Codes 3, 4 and 5 and up to 1275mm in Codes 6, 7 and 8 in standard roll lengths of 3 and 6 metres. Non-standard lengths and thicknesses are available upon request. Please be aware that extra charges and extended lead times may apply.

British Standard rolled lead is produced to a calculated theory weight with a tolerance of +/- 5%. Theory weights of standard rolls can be found on the BLM weight chart below.

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Product Details

BLM’s rolled lead sheet comes with a 50 year warranty providing it is installed in accordance with the LSTA’s Rolled Lead Sheet Manual and BS 6915. Lead sheet applications also achieve a rating of A or A+ in the BRE Green Guide.

  • If the width you require is not in stock it is worth ordering a wider piece to avoid delay.
  • Save on cutting charges by ordering a standard length and cutting it yourself.
  • Large orders of lead can be delivered direct to site at no extra cost.
  • Lead sheet should be fitted in accordance with BS 6915 as detailed in Rolled Lead Sheet – The Complete Manual by the LSTA.

The most common cause for failure of lead sheet used in roofing and cladding applications is from cracks developing as a result of thermal expansion and contraction due to individual pieces of lead being oversized. The maximum size recommended for each thickness or code of lead varies; the thicker the lead the larger the piece that can be laid.

Lead sheet on buildings is usually fixed externally and is therefore subjected to conditions of changing temperature. Limiting the size of each piece of lead sheet ensures that the amount of thermal movement within the jointing and fixing details is not excessive and there are no undue restrictions on this movement. Whilst there needs to be sufficient fixings to support the lead, it is important to note that over fixing can restrict the free thermal movement of the lead, causing the sheet to buckle, which in turn will result in fatigue, cracking and possible failure.

Joints for leadwork are designed to allow for thermal movement. A joint must be weather-tight in its selected position and not formed too tightly. End to end joints between step and cover flashings, pitched valley gutters, pitched roofing and cladding pieces are called laps. The lap diagram below indicates the minimum lap required for each degree of pitch. View lap graph

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