221005 MArys D&AStatement - Flipbook - Page 67
Infill structure TBC to allow
new wall to be tied into
existing gable wall full height
Roof Design Philosophy
Small
consulting
room
Ridge chords TBC (Allow
200x200 C24)
Void above
entrance hall
Lateral forces from 'roof spread'
internalised by diaphragm action
i.e. only vertical force applied to
supporting structure under gravity
loading
Folded plate roof spans between valley
beam and perimeter walls
Lift
Landing
2000
Multi-function room
Line of existing building to be
demolished
Valley beam
Office / kitchen
Steel end plate connection face
fixed to existing masonry via
resin anchors
Entrance hall
2400
Valley beam supported via vertical
PFC under fixed to existing
masonry via resin anchors
2261
Note: Internal wall does not provide
support for roof - connection to ensure
head restraint to wall but allow relative
vertical movement
UB 305x165x54 (Valley Beam)
Roof structure supported off
existing masonry walls via resin
anchored wall plates
Construction Sequencing:
Temporary propping of ridge chords required until plywood sheathing has been fixed in place (potential
Planted courtyard to pre-fabricate each roof slope and lift into place). Alternatively a steel ridge beam arrangement with
2No. 50x200 C24
3No. 50x200 C24
3No. 50x200 C24
hipped end could be adopted.
Key
50 x 200 C24 rafters at 400c/c with 2 x 18thk ply
sheathing over
Multi-purpose
room
2No. 50x200
C24
UB 203x133x25
Loft space for plant
Timber wall below
Ridge chords TBC (Allow
200x200 C24)
Project Title
St Mary's Church, Primrose Hill
Drawing Title
Roof Plan
Drawing Reference
4455 - 03
Mary’s, Primrose Hill
By
PG
Date
25 / 05 / 21
Dow Jones Architects