The Evolution of Level Threshold Drainage

This unique system from Allproof utilises aspects from our two original designs, the cantilever bracket and threaded leg system. We have learnt that a securely mounted frame greatly increases strength in areas of use, especially in high traffic areas, and the support legs provide reinforcement as the grates become wider.

Allproof incorporates its own unique 12mm rubber spacer to ensure the drip line from sill is maintained.

The frame cleverly makes the adjustment required to take up the differing remaining space to the building with our in house fabrication.

We utilise a 123mm wide grate, this is standard from our existing polymer concrete range. See detail 1A showing dimensions.

All level threshold applications require the construction of a boxed channel - this creates the 200mm width required.

At the time of this construction anchors will be fitted to be set into the concrete pour and left protruding into the formed channel when boxing is removed.

This allows the “bolted bracket frame” to drop in onto and be fastened to the bolts at a later stage. This removes the requirement of the system to be on site until later in the construction schedule, removing pressure around time of pour. See install detail 1B.

When tiles or pavers are to be used, the height of the frame and grate can be raised to suit by setting the bolts lower. See detail 1C.

Wider applications in large doorways can be satisfied with the same system. See detail 1D.

Once the frame has been installed the grates can be fixed with provided security bolts completing the system.

Specification Codes:

Code Description

BBWW Bolted Bracket with Wedge Wire Grate

BBLAS Bolted Bracket with Laser Cut Steel Grate

BBSS Bolted Bracket with Pressed Stainless Grate

BBGFN Bolted Bracket with Glass Filled Nylon Grate

BBHCI Bolted Bracket with Heelproof Cast Iron Grate

Level Threshold- Bolted Bracket

Bolted Bracket (BB)

Grate Options

Wedge Wire (WW)***

Laser Cut Steel (LAS)***

Pressed Stainless (SS)**

Glass Filled Nylon (GFN)*

Cast Iron, Heelproof (HCI)*

Wedge Wire (WW)***

Laser Cut Steel (LAS)***

Pressed Stainless (SS)**

Glass Filled Nylon (GFN)*

Cast Iron, Heelproof (HCI)*

* Come in 500mm lengths. ** Standard length of 1m. *** Custom lengths available.

Vari

able

Sta

ndar

d W

idth

s (1

23m

m)

allproof.com

Detail

1B

(BB)Technical Details

Detail

1A

Detail

1C

Detail

1D

Internal Floor

Cast-in Anchor Points

Door JoineryAdjustable Leg

External Pavers/Tiles

2x GFN Grates

Folded Return

Bracket against concrete extended to set the bolts lower into the concrete channel (50mm from concrete surface)

Door Joinery

123mm

130mm

VariableFall

12mm

Internal floor

150mm

200mm

7

Do’s and Dont’s

› Be sure to get straight clean finished edges to concrete.

› As standard this system uses butt joints for corners, not mitred.

› Contact the Allproof team if you have any queries.

Set up the anchors (M12) on the boxing. Anchors on the frame are set to 500mm intervals, set the first anchor 250mm from the concrete edge and 500mm from there on.

For concrete surfaces set anchors 50mm from top of frame/finished concrete level.

Set up your boxing to form a 150mm(H) x 200mm(W) channel.Note: Ensure that concrete edge

will have a clean finish as frame will need to sit flush to edge.

1

2 3

4 5Remove timber boxing and install frame with adjusting

the leg height to suit.

Pour concrete.

Insert grate and secure to frame.

Install Details (BB)

Door Joinery

Building Line

Timber Boxing

Exterior Concrete Pour

BB Frame

Grate Lock Downs

Adjustable Legs

Anchors and Nuts

Anchors

500 500 500250

200

150

1000

500500

250

Level Threshold- Bolted Bracket