Repairs to 19 year old Mastic Asphalt Roof
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This office Building roof was laid in 1988, BSS 6925 Roofing Grade with a partial coverage of BSS 1447 Paving Grade for a wheeled window washing gantry.
The gantry has been mothballed since.
Because of the differing stone content between the Roofing and Paving Grades, there has been some thermal movement and the junction is cracking in the Roofing Grade.
If left to deteriorate these cracks would open up right through the 19mm thickness to the concrete substrate and cause the roof to leak.
This project was about digging out the existing cracked fillet and replacing with new Roofing Grade Mastic Asphalt. (approx. 1000 lineal feet of)
view of the asphalt roof, east side, looking south towards Port Nicholson view of the south side, looking west
view of the north side, looking west view of the west side, looking north
some surface crazing in the Roofing Grade mastic asphalt, approx 5-10mm deep an example of the cracking of the fillet at the intersection of the two grades of mastic asphalt on the inside area of the roof
another example of the cracking of the fillet at the internal intersection of the two grades of mastic asphalt an example of the cracking of the fillet at the intersection of the two grades of mastic asphalt on the outside of the paving grade near the outside perimeter of the roof
an example of crazing of the roofing grade and cracking of the fillet at the internal upstand of the Plant Room an example of the cracking of the fillet at the intersection of the two grades of mastic asphalt near the air conditioning water tower fence wall
close up view of the fillet cracking - a severe example another example of the cracking of the fillet at the intersection of the two grades of mastic asphalt on the outside perimeter on the east side
the blocks of mastic asphalt loaded to the plant room level the blocks are broken up smaller and melted down in a small LPG fired bucket repair pot
the repair pot heating the asphalt down to molten form the first step is to heat up and dig out the old fillet with a hot trowel
close view of the dig out the second step is laying the new mastic asphalt and forming to the 45 degree angle
close view of the new fillet dipping the mastic out of the bucket
the third step is to warm the edges between the new and the old mastic a completed section of new fillet, west side
the fourth step is to coat the repair with a bituminous aluminium paint for UV protection close up of the completed repair
new fillet to the outside perimeter, west side new fillet to the outside perimeter, north side
laying new fillet on a warm November day new fillet to the outside perimeter, south side
working in the shade on a hot day using a soft broom to paint the repair is easier on the back
new fillet to internal section south side same section with the UV coating
working outside the perimeter fence, fully harnessed the outside edge in previous pic
completed section east side looking south completed east side, reverse view of previous pic
some repair preperation to surface crazing in the Roofing Grade mastic asphalt on the west side which takes the sun most of the day the crazing repaired with new mastic asphalt
completed repairs to the Roofing Grade on the west side closer view of the completed repairs to the Roofing Grade, west side