Installation

Head Installation

Cast Stone Head Installation
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Installation Guide Stone Heads

Decorative heads are not load bearing therefore suitable support will be required. The supporting lintel will be visible on the soffit. It is important to maintain the free movement  of the head by separating it from the supporting steel and surrounding brickwork. Decorative heads over 1500mm  will generally be supplied in pieces.


Laying the lintel.

Follow the lintel manufacturers installation advice.

  1. Lintels should be installed with a minimum end bearing of 150mm, bedded on mortar and levelled along its length and across its width.
     
  2. Raise the inner and outer leaves simultaneously to avoid excessive end loading, the masonry should be laid on a mortar bed and all perpendicular joints should be filled.
     
  3. The external lintel flange must project beyond the window/door frame and it is recommended that a flexible sealing compound is used between the underside of the lintel flange and the frame.
     
  4. In accordance with BS EN 1996-2 and NHBC requirements all external wall lintels must be installed with a flexible DPC (with the exception of those adequately protected by an eaves overhang or similar form of protection). Stop ends should be provided to avoid moisture entering the cavity near the reveals.
     
  5. Form an integral stop end at the end of the head or incorporate proprietary stop ends. Provide weep holes at each end and at joints in the head if supplied in pieces. Place DPC slip plane along full length.


Laying the decorative head and secondary DPC.

  1. Mortar the head onto the slip plane on a full bed of mortar but leave the ends clear.
     
  2. Lay DPC slip plane then the second cavity tray with stop ends extending to a suitable mortar perpendicular joint to suit the brickwork course above.
     
  3. The DPC cavity tray should extend a minimum 150mm up toward the inner leaf.
     
  4. Ensure weep holes are positioned at each end and at additional recommended spacings when required.
     
  5. Lay surrounding brickwork on a full bed of mortar on top of the slip plane as normal ensuring it is in line and plumb.
     
  6. To maintain free movement at the end of the head insert backing cord above weep vent and apply flexible sealant to match.

Generally, when laying cast stone products mortar strength should not exceed designation (iii), 1:1:5/6 cement:lime:sand proportional mix.  
The use of lime is desirable to accommodate movement. Mortar no stronger than strength class M4 can be specified however movement may be restricted if lime is not a constituent element. Cracking can occur if mortar of a  higher strength than recommended is used or if movement  of the cill is restricted by mortar pointing.

Note: Bekstone Cast Stone Heads are decorative and should be used in conjunction with a suitable load-bearing lintel. To reduce the risk of cracking, the head should be fully bedded on mortar along the entire length of load-bearing lintel. This ensures that any load above the head is fully and evenly distributed on the load-bearing lintel.

For further help and advice please contact the sales office on 01993 842391