Light Engineered Restraint Strap

A direct replacement for traditional restraint straps, the innovative design of these lightweight straps allows ease of handling and installation whilst maintaining the structural strength and robustness of much heavier weight types.
The HES (heavy engineered strap) & LES (light engineered strap) replace
traditional heavy and light restraint straps in roof and floor construction.
Reducing the thickness allows the LES strap to span the bottom
chords of trusses and over floor joists without the need for notching.
LES straps are less than 40% of the weight, quicker to fit, and overcome many fixing problems associated with traditional heavy straps.
The LES is designed for vertical applications e.g. holding down wall plates.

Formed edge design gives additional strength on bend
Quicker to install - can fit over top of floor joists and truss bottom chords
Easier to course with blockwork
No need to notch joists
Complies with BS EN 845-1

Technical Data Sheet

CE Marking

EPD

Technical Data

Dimensions

LES Product Dimensions

References	Installation Type	Dimensions [mm]				Holes			Weight [kg]
		A	B1	B2	t	Flange B2	Flange B1
		A	B1	B2	t	Ø4.1	Ø4.1	Ø6.1
LES06B10	Vertical	35	500	100	1.2	3	8	8	0.18
LES08B10	Vertical	35	700	100	1.2	3	12	12	0.241
LES10B10	Vertical	35	900	100	1.2	3	16	16	0.302
LES12B10	Vertical	35	1100	100	1.2	3	20	20	0.362

LES Performance Values

References	Fasteners			Characteristic Load [kN]
References	Masonry Wall	Floor Joist or Rafter	Wall Plate	Characteristic Load [kN]
LES	5 - 5.5x50mm Wood Screws	-	3 - N3.75x30	4

Installation

Horizontal strap installation

Approved Document A of the Building Regulations requires lateral restraint to be provided at each floor at a maximum of 2 metre centres
Restraint straps “perpendicular” to the floor joists are required to be held tight against the masonry and fixed across the first 3 joists
Restraint straps “parallel” to the floor joists are required to be held tight to the masonry and be at least 1200mm long
The characteristic tensile strength for horizontal restraint straps should not be less than 8kN

Vertical strap installation

Vertical strapping, at least 1 metre in length, should be provided at eaves level to hold down timber wall plates, at intervals not exceeding
2 metres
Fix LES or L strap to wall plate with 3 No 3.75 x 30mm square twist nails and to masonry with 5 No 5.5 x 50mm wood screws, plugged and screwed into masonry.
The lowest fixing should be located within 150mm of the bottom of the vertical strap.
Where L strap is fixed to truss, install with 3.75 x 30mm square twist nails, quantity depending on required uplift values.