Parkade roof membrane remove and replace. Concrete topping replacement, site redesign, new drains, new landscaping.

1. Failing
membrane
evident by leaks
into parkade.
Signs of rust
were minimal
with no spalling.
Optimum time
to replace the
membrane.
Concrete stair
riser failure.
Creates tripping
hazard. To be
replaced.

2. Planters and soil removals completed.
Next, dismantle playground equipment
and remove concrete topping.

3. Excessive thickness of the topping slab
without a separation or drain mat on the
membrane made removals more difficult
than expected.
Typical 4” thick topping was 7” average
thickness.

4. Existing membrane under the concrete
topping was still flexible but did show
some locations of oxidation and cracking
as shown.
Membrane was a seamless liquid
polymer modified asphalt with a good
bond.

5. Unexpected
poor
construction
detail of
downspout tie
in through the
structural slab.
Cast iron pipe
was broken at all
locations.
Poor drainage
on the structural
slab meant the
need for
additional
drains.

6. Deck concrete topping removed.
All loose membrane removed.
Structural deck surface washed and
ready for new drains.

7. 16 new drains were installed using
proper cast pipe and Watts 4” drains
with bi-level drainage for the membrane
and surface runoff.

8. 16 new drains were installed with double
reinforced tie in details.

9. Problematic with a failed membrane
system. Water has ingressed under the
occupant units and now is trying to
egress back out.
Waiting for it to dry out is not an option
but resolved with special techniques.

10. Application of the Bakor 790-11 liquid
rubberized asphalt membrane reinforced
with a polyester sheet before a top coat
is placed.

11. Application of Bakor drain boards to
ensure drainage under the concrete
topping and eliminate ice lens lifting of
the topping and hydraulic cracking of the
topping slab.
BASF polyurethane coating applied to
vertical surface to protect membrane tie
in edge.
New hydro conduit installed for new
lighting system.

12. New fiber reinforced concrete is placed on top the drain
mat.

13. Front entrance redone (straightened &
wider). Landscaping to be completed.

14. Stairs reconstructed and painted.

15. New electrical complete to replace the old
as wiring was not to code and corroded.
Landscaping is completed with new
Gardenscape wall and turf.

16. Soil area changed to turf. Redwood cedars
removed to brighten up area and help limit
moss growth.
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» BEFORE PICTURE
» AFTER PICTURE