Connectors for Masonry, Timber and Steel Construction

H/L

Heavy/Light Restraint Straps

The H and L straps are designed to The Building Regulations for
horizontal and vertical restraint.

Heavy restraint straps meet requirements for lateral restraint of roof trusses, rafters and joists tied into masonry walls.
Light restraint straps are designed for vertical loads such as wall plates on top of masonry walls.
All common sizes in stock from 500 to 2000mm long, 50mm increments. Longer lengths avaialble to order; contact technical support.

Technical Data Sheet

CE Marking

Product Details

Images

C_HeavyRestraintStrapsBend_ProdPho_Pho_Prod_Bend_HeavyRestraintStrapsBend_EU_EN_C0.jpg

C_HeavyRestraintStraps_ProdPho_Pho_Prod_Flat_HeavyRestraintStraps_EU_EN_C0.jpg

Features

Material

Pre-galvanised mild steel
Stainless steel straps are available, to order

Flat Strap

Strap with a Bend

Strap with a double bend.

Strap with a twist

Strap with a bend and a twist

Autres

restraint-strap-order-form.pdf (376.94 KB)

Technical Data

Dimensions

Common Bent Straps

References	Installation Type	Dimensions [mm]					Holes
		Overall Length [B]	A	B	B₁	t	Total	Flange B1
		Overall Length [B]	A	B	B₁	t	Ø6	Ø6
H06B10	Horizontal	600	28	600	100	4	23	3
H08B10	Horizontal	800	28	800	100	4	31	3
H10B10	Horizontal	1000	28	1000	100	4	39	3
H12B10	Horizontal	1200	28	1200	100	4	47	3
H15B10	Horizontal	1500	28	1500	100	4	59	3
H16B10	Horizontal	1600	28	1600	100	4	63	3
H06B15	Horizontal	600	28	600	150	4	23	5
H08B15	Horizontal	800	28	800	150	4	31	5
H10B15	Horizontal	1000	28	1000	150	4	39	5
H12B15	Horizontal	1200	28	1200	150	4	47	5
H15B15	Horizontal	1500	28	1500	150	4	59	5
H16B15	Horizontal	1600	28	1600	150	4	63	5
L06B10	Vertical	600	28	600	100	2	23	3
L08B10	Vertical	800	28	800	100	2	31	3
L10B10	Vertical	1000	28	1000	100	2	39	3
L12B10	Vertical	1200	28	1200	100	2	47	3

Common Twisted Straps

References	Dimensions [mm]				Holes
	A	B	T1	t	Total	Flange B1
	A	B	T1	t	Ø6	Ø6
H06T15	28	600	150	4	22	6
H10T15	28	1000	150	4	38	6
L06T10	28	600	100	2	22	4
L10T10	28	1000	100	2	38	4
L12T10	28	1200	100	2	46	4
L12T15	28	1200	150	2	46	6

Common Flat Straps

References	Dimensions [mm]				Holes
	Overall Length [B]	A	B	t	Total
	Overall Length [B]	A	B	t	Ø6
H10F00	1000	28	1000	4	40
H12F00	1200	28	1200	4	48
L10F00	1000	28	1000	2	40
L12F00	1200	28	1200	2	48

Performance Values

References	Fasteners			Characteristic Capacity [kN]
	Masonry	Wall Plate	Floor Joist / Rafter
	ø5.5x50	N3.75x30	N3.75x30
HxxBxx	-	8	-	8
LxxBxx	5	-	3	4

Installation

Use all specified fasteners.
Horizontal lateral restraint straps should be spaced not more than 2m centres and attached to at least 3 timber members through the use of noggings and packing.
Attach to timber members using specified fasteners. The bend length should be a minimum of 100mm and should be positioned at the centre of an uncut block or brick.
Vertical restraint strapping should be at least 1m long.
Where straps are fixed to masonry, hardened nails Ø4mm x 75mm long or wood screws into plastic plugs Ø5.5 x 50mm long should be used. The lowest fixing should be located within 150mm of the bottom of the vertical strap.

Non standard straps are available to order.

To order: Specify model series, overall length, bend (B) dimension and/or twist (T) dimension.
Example: Heavy strap that has an overall length of 1m, a bend at 10cm and a twist at 20cm. (See illustration for detail on measuring bend & twist dimensions).

B10

T20

Strap

Type

Strap

Length (dm)

Bend

Length (cm)

Twist

Length (cm)

Horizontal lateral restraint straps should be spaced not more than 2m centres and attached to at least 3 timber members through the use of noggings and packing.
Attach to timber members using a minimum of 8 no. 3.75 x 30mm square twist nails. The bend length should be a minimum of 100mm and should be positioned at the centre of an uncut block or brick.
The downturn of strap is to be held tight against the cavity face of the inner leaf of blockwork.

Fixing to solid noggings

Straps to be installed at not more than 2m centres (or 1.25m where appropriate) along pitch of gable end.
Ensure the position of the straps coincides with the block bed joint.
Install HES or H strap to underside of solid noggings. Noggings to be fixed horizontally to avoid twisting of the restraint straps. (1)
The downturn of strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located and bedded on a substantial piece of blockwork, i.e. over the centre of a full block, with a single cut block over the strap. (3)
Fix straps to noggings/trusses with eight 3.75 x 30mm square twist nails, evenly distributed along the length of the strap. (For NHBC warrantied buildings, in accordance with NHBC Standards 2017, section 7.2.8, four 50mm (minimum) x 4mm steel screws or four 75mm x 4mm round wire nails, with one fixing into the third rafter, shall be used instead of the square twist nails).
Strap to be of sufficient length to be fixed to a minimum of three trusses.

Fixing to longitudinal binder to truss rafter

Straps to be installed at not more than 2m centres (or 1.25m where appropriate) along pitch of gable end.
Install HES or H strap on the 25 x 100mm longitudinal Rafter bracing (1).
Where the position of the strap does not coincide with an existing longitudinal binder, and block bed joint, then the strap can be fixed to an additional 25 x 100mm binder. The binder is to be fixed over four trusses and nailed twice to each rafter with 3.35 x 65mm round wire nails.
Ensure the position of the additional binder and strap coincide with the block bed joint.
The downturn of strap is to be held tight against the cavity face of the inner leaf of blockwork (2), preferably located and bedded on a substantial piece of blockwork, i.e. over the centre of a full block, with a single cut block over the strap (3) (notch the block to accommodate the twist of the strap and ensure notch is fully mortared).
Fix straps to bracing with eight 3.75 x 30mm square twist nails, evenly distributed along the length of the strap (For NHBC warrantied buildings, in accordance with NHBC Standards 2017, section 7.2.8, eight 25mm x 4mm steel screws shall be used instead of the square twist nails).
Strap to be of sufficient length to be fixed to a minimum of three trusses.

Vertical application

Fix LES or L strap to wall plate with 3 no. 3.75 x 30mm square twist nails and to masonry with 5 off dia. 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.