The manufacturer recommends that two persons are used to build BoSS Towers. Above
4m height, it is essential that at least two persons are used. Only climb the tower from the
inside. Always start building with the smallest height frames at the base of the tower:
ASSEMBLY PRINCIPLES
Platform height in metres Frame at base
1.7, 2.2, 3.7, 4.2, 5.7, 6.2, 7.7, 8.2, 9.7, 10.2, 11.7, 12.2 2 rung
2.7, 4.7, 6.7, 8.7, 10.7 3 rung
1.2, 3.2, 5.2, 7.2, 9.2, 11.2 4 rung
1450 towers:
Platform height in metres Frame at base
1.7, 2.2, 3.7, 4.2, 5.7, 6.2, 7.7, 8.2, 9.7, 10.2, 11.7, 12.2 2 rung
2.7, 4.7, 6.7, 8.7, 10.7 3 rung
1.2, 3.2, 5.2, 7.2, 9.2, 11.2 4 rung
850 towers:
During use
Wind description Beaufort scale Beaufort no. Speed in mph Speed in m/sec
Medium breeze Raises dust and loose paper, twigs snap off 4 8 - 12 4 - 6
Strong breeze Large branches in motion, telegraph wires whistle 6 25 - 31 11 - 14
Gale force Walking is difcult 8 39 - 46 17 - 21
• Beware of high winds in exposed, gusty or medium breeze conditions. We recommend that in wind speeds over 7.7 metres per second
(17mph), cease working on the tower and do not attempt to move it. If the wind becomes a strong breeze, (expected to reach 11.3 metres per
second - 25 mph) tie the tower to a rigid structure. If the wind is likely to reach gale force, (over 18 metres per second - 40 mph) the tower
should be dismantled.
• Beware of open-ended buildings, which can cause a funnelling effect.
• Raising and lowering components, tools, and/or materials by rope should be conducted within the tower base. Ensure that the safe working
load of the supporting decks and the tower structure is not exceeded.
• The assembled tower is a working platform and should not be used as a means of access or egress to other structures.
• Beware of horizontal forces (e.g. power tools) which could generate instability. Maximum horizontal force 30kg.
• The stairway towers, featuring an inclined staircase access, are for frequent use by personnel carrying tools and/or materials.
• Do not use boxes or stepladders or other objects on the platform to gain extra height.
ASSEMBLY PROCEDURE
Assembly for 850 towers
Insert adjustable leg/castor assemblies into end
frames and lock the castors (see step 1 of the
1450 assembly). Base plates can be tted to the
adjustable legs if it is not necessary to move the tower.
Fit two horizontal braces (red) to the 850 end frames as
shown in Steps 2 and 3 for the 1450 tower procedure.
1
Fit a trapdoor deck on the 2nd rung. Fix the
horizontal braces (red) as guardrails on the 3rd
and 4th rungs (2 and 4 rungs above the platform)
on both sides of the tower.
2
Fit two diagonal braces (blue) in opposing directions
between the 1st and 3rd rungs. Ensure that the frames are
vertical and level by checking with a spirit level and setting
the adjustable legs as necessary. Fit stabilisers. Fit the next pair of
end frames and check the frame interlock clips are engaged.
IMPORTANT. Only use the adjustment on the legs to level the
tower and not to gain extra height.
Fit two pairs of diagonal braces in opposing directions
between the 3rd and 5th rungs and the 5th and 7th rungs.
Locate a trapdoor deck on the 6th rung, with the trapdoor
next to the ladder.
4Climb up the inside of the tower and from the protected
position of the trapdoor, t guardrails to the 7th and 8th
rungs (in that order) on both sides of the tower.
5
Continue the procedure until the required working height is
reached, adding additional pairs of end frames, diagonal
braces and tting trapdoor platforms, as shown on previous steps.
At every platform level, add horizontal braces as guardrails from the
protected position within the trapdoor (as shown in Step 5).
Fit a single diagonal at the top of the tower as shown. Fit the toe
boards - see the component section for guidance on how to t.
The tower is now complete.
6ASSEMBLY PROCEDURE
Assembly for 1450 towers
Push castor into adjustable leg. Push castor/adjustable leg
assemblies into 2 rung span frame. Lock castors. Repeat
procedure with 2 rung ladder frame.
Note: Base plates can be tted to adjustable legs in lieu of
castors if it is not necessary to move the tower.
1
Fit one horizontal brace (red) onto the vertical of a span
frame, just above the bottom rung, with the claw facing
outwards. The frame will now be self supporting. NB: All locking
claws must be opening before tting.
2
Position the ladder frame as shown and t the other end
of the horizontal brace on to the vertical. Fit a second
horizontal brace on the other side of the frames to square the tower.
3Fit a trapdoor deck on the 4th rung (2.0m) with the trapdoor
next to the ladder. Ensure the trapdoor is positioned with the
hinges towards the outside of the tower as shown. Climb the ladder
and, from the protected trapdoor position, t guardrails on the 5th
and 6th rungs (in that order) on both sides of the platform.
Do not climb onto the deck until all guardrails are in place.
When horizontal braces are tted as guardrails, they should be
0.5m and 1.0m (1 and 2 rungs) above the platform level in all cases.
Remove the temporary deck from the lowest rung.
5
Unlocked
Locked
Locked
Fit two additional end frames,
ensuring the frame interlock
clips are engaged. Fit two diagonal
braces (blue) in opposing directions,
between the 1st and the 3rd rungs.
Ensure the frames are vertical and level
by checking with a spirit level and setting
the adjustable legs as required.
Fit a temporary deck on the lowest
rungs.
Fit stabilisers.
IMPORTANT - Only use the
adjustable legs to level the tower
and not to gain extra height.
4
Fit the next pair of diagonal
braces in opposing directions
between the 3rd and 5th
rungs. Add two additional end frames.
6
Add two more diagonal braces between the 5th and 7th
rungs. If nishing at this height (4.2m platform) reposition
the xed deck to the 8th rung on the tower. Fit a trapdoor deck
alongside it, with the hinges towards the outside of the tower, and the
trapdoor next to the ladder. Add a single diagonal between the 7th
and 9th rungs as shown. Climb up the ladder, and from the protected
trapdoor position, t the guardrails on the 9th and 10th rungs, in that
order, on both sides of the tower.
7
ASSEMBLY PROCEDURE
When building beyond
a 4.2m platform height
Continue to add pairs of end frames, diagonal braces and
t trapdoor decks as shown in the previous steps. Add
guardrails at 0.5m and 1.0m, (in that order), above the platform from
the protected trapdoor position.
Do not climb onto the deck until all guardrails are in place.
8
Fit the toe boards - see the component section for guidance
on how to t.
The tower is now complete.
9
Continue until the required height is reached.
Re-position the xed deck to the required platform height and t a
trapdoor deck alongside it as shown in Step 7. Fit a single diagonal
at the top of the tower as shown in Step 7. Fit the nal guardrails as
shown in Step 7.
DISMANTLING
PROCEDURE
To take down the tower reverse the building sequence. When
removing guardrail braces, unlock the four claws furthest from the
trapdoor and then return immediately to the protected position within
the trapdoor. You may then unlock the claws at the other ends of the
guardrails to remove them from the tower.
For a detailed user guide, please go to
bossaccesstowers.com/literature
3
Where all three frame heights
are used in a tower, start with
2 rung frames at the base, with
the 3 rung frames next and the 4
rung frames on the top. Refer to
the Quantity Schedules for detail.
The procedure illustrated shows
a 1450 tower starting with a 2
rung frame and a platform height
of 4.2m. If building an 850 tower,
the following method can be used
with single decks at all levels.
PN03304300 BoSS_DL_Folded_Zone1_Quick_Guide rev1217.indd 2 11/12/2017 15:32
