Attachment 4 - Site Investigation and Slab Report

and built into the masonry wall Figure 25. The
practice of building masonry (including sills) hard
against window or door frames at the location of an
articulation joint is not recommended Figure 26.
     Full-height windows, or windows with infill
panels below the sill, eliminate the need to form
an articulation joint in the masonry. Instead the
architrave and external cover strip conceals the
full-height gap of the articulation joint between the
window or door and wall Figure 25.
     Masonry is not recommended above window
or door heads when building on reactive soil sites.       Eaves lining above external
                                                          wall and window/door heads
For this reason the openings shown in Figure 24
and Figure 27 extend to the top wall plate or eaves       External masonry wall
lining. If the window or door itself cannot be taken to   stops under eaves lining
this height, then an infill panel should be provided.
Beams over windows or doors supporting a top              Figure 28 Boxed or (horizontal) soffit-lined eaves
plate and spanning between articulated wall panels
should be free to move on the masonry walls on
both sides. Where masonry can not be avoided
above openings, and for two-storey walls, refer           External wall supports roof structure
to Section 6 for joint and lintel details that allow
movement at joint locations.                              Eaves support framing, fixed to roof
                                                          framing and not masonry wall
     Articulation joints should not be located in
narrow masonry panels between two window                  Alternative raked
                                                          eaves lining
or door openings as zig-zag cracking at the
sill level may develop. A sufficiently wide
panel of masonry should be provided between
openings to reduce the risk of cracking
Figure 27 (1200 mm minimum is recommended
by the Brick Industry Association, USA8).

7.3      Wall/Eaves Junctions
                                                          Horizontal eaves lining
The amount of movement, which must be
accommodated in articulation joints under doming          Optional cover moulding fixed
                                                          to supporting timber for
action, increases from zero at the bottom of the
                                                          horizontal eaves or rafter/
joint to a maximum at the top. It is therefore            top plate for raked eaves
advantageous to keep wall heights as low as
possible. For this reason, the use of boxed or            Figure 29 Eaves detail – roof supported on external
soffit‑lined eaves is recommended for buildings           leaf of masonry wall
having articulation joints. Eaves may be finished
by resting the eaves lining on top of the external
masonry walls. At window and door openings a
simple framing of timbers hung from the roof
structure supports the eaves lining Figure 28.
    Where the external leaf of a masonry wall is
used to support the roof structure, or where a
single-leaf masonry wall is used, then raked or
flush eaves provide a good detail for an articulated
building. There are two methods of detailing raked
eaves – with exposed rafters, or by lining under the
rafters. Either way, the cover moulding between
eaves and the wall should be attached to the top
plate or rafters, thereby allowing the masonry
to move independently and articulation joints to
function properly Figure 29.


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