Wardray Premise have bonded lead to plywood and plasterboard to produce panelling for radiation shielding for over 80 years. The increased demand for lead plasterboard incorporated into dry lining systems prompted the introduction of a mechanised spray booth and laminating equipment to give greater efficiency in the production of these panels.
This machinery has resulted in a dramatic increase in productivity, giving significant cost savings to the customer and extremely fast deliveries on a worldwide basis.
We also provide some service penetrations, furniture supports and storage units.
The bonding of lead to plasterboard produces a panel particularly suited to dry lining partitions. It can be installed as an inner layer where fire rating is required or as a smooth finished surface to receive a plaster skim coat and final decoration.
For ceilings and floors, lead plywood is recommended as it has greater structural strength and is easier to handle.
Tests have been undertaken and confirm that using 32mm dry lining screws, the integrity of the shielding will be maintained by fixing through the lead panel and lead tape.
This applies only for lead thicknesses up to and including Code 7 sheet lead (3.15mm).
A copy of our test report No 5177 from The Radiological Protection Centre dated 26 September 2003 relating to the use of lead tape and steel screw fixings is available on request.
The lead plywood illustrations show lead in a thickness in excess of code 7, where it is necessary to put the lead on the internal face of the battens.
Applying panels to an existing wall would normally require the installation of battens. Using a leaded batten completes the same groundwork with the advantage of full protection to the panel joints.
For dry lining partitions in a number of differing profiles it is acceptable to introduce lead tape of a similar lead thickness to the panel. This is applied to the front face of the stud. The panels are then fixed through the tape into the stud which provides full protection to the joints.
Panels are supplied up to 600mm wide and to a maximum height of 3000mm. They are single sided but with a minimum plasterboard thickness of 12.5mm.
Should protection be required in excess of the 3000mm maximum panel height, a horizontal noggin is introduced (either leaded batten or leaded tape) to provide protection at that panel joint. Additional lead lined horizontal battens or plates can be supplied in widths to suit fixing of viewers, electrical outlet sockets, apron racks, cupboards etc. Protection to pipes and ventilation ducts can also be provided.
Panels and battens are easily cut using conventional hand or power saws.
If protection is not required to the full height of the board, lead can be applied to the lower area and the plasterboard left untrimmed to provide a flat front surface to 3000mm. As an alternative a top capping can be supplied.
The bonding of lead to 12mm plywood gives structural strength and provides a suitable alternative for ceilings. It is strongly recommended that the overall panel weight does not exceed 25kg.
For floor protection, the plywood can be reduced to 9mm and the edges rebated to receive lead tape, protecting the joints and giving a flush finish.
Doors and FramesTop
If protection is required to existing doors and frames, lead bonded to 6mm plywood is available. This assumes that the door construction and hinges or sliding door gear are suitable for the additional weight.
We are able to produce panels up to 80kg as our production process involves a minimal amount of manual handling. However, for deliveries, off-loading on sites and final installation, we strongly advise that panels do not exceed an overall weight of 62kg for plasterboard and 75kg for plywood.
This should be reduced to 25kg if fixing to a ceiling. We further recommend that panels are reduced in size and therefore weight, if fixed to walls at high levels (see table left). For safety purposes, appropriate manual handling training is recommended regardless of panel size or weight.
Total estimated weights of some example panels are listed below.
|Panel Type||Plasterboard 600mm wide||Plywood 600mm wide|
|Code3 lead (1.32mm)||35kg||43kg||30kg||36kg|
|Code4 lead (1.80mm)||43kg||53kg||38kg||46kg|
|Code5 lead (2.24mm)||50kg||62kg||45kg||55kg|
|Code6 lead (2.65mm)||57kg||71kg||52kg||64kg|
|Code7 lead (3.15mm)||65kg||81kg||60kg||74kg|
Shielding In Excess of Code 7 (3.15mm Lead)Top
Up to a thickness of approximately 8mm, lead plates are bonded to plywood for wall and ceiling panels with the necessary leaded battens providing support and shielding of panel joints.
A similar system is used to produce panels for floor protection but the edges are rebated to receive lead tape, protecting the joints and giving a flush finish.
Lead Chevron BricksTop
Where shielding exceeds 10mm, the use of interlocking lead chevron bricks is a cost effective solution.
They are installed to a secure base or framework lined with plywood to provide a flat surface in single or multiple layers, complete with suitable fixing brackets to accommodate a final internal lining.
These shielding requirements are considered to be site specific.
Quotations and layouts are produced on an individual basis.
Please contact our estimating team for more information.
The images on the right show chevron lead bricks used for shielding the UK’s first CyberKnife® installation at the Harley Street Clinic in London. The image below shows a lead shielded door for an industrial facility at Nakilat ship repair yard, RAS Laffan, Qatar.
Read More: Lead Chevron Bricks Read More: Shielding for Non-Destructive Testing (NDT)