All re-roofing shall conform to the applicable provisions of Chapter 32 of this code.
Roofing materials and methods of application shall comply with the U.B.C. Standards or
shall follow manufacturer's installation requirements when approved by the
New roof coverings shall not be applied without first obtaining an inspection by the
building official and written approval from the building official. A final inspection and approval shall be obtained from the building official when the re-roofing is complete. The pre-roofing inspection shall pay particular attention to evidence of accumulation of water. Where extensive pounding of water is apparent, an analysis of the roof structure for
compliance with Section 3207 shall be made and corrective measures, such as relocation of roof drains or scuppers, re-sloping of the roof or structural changes, shall be made.
An inspection covering the above listed topics prepared by a special inspector may
be accepted in lieu of the pre-inspection by the building official.
A.)Built-Up Roof Covering
1.) GeneralBuilt-up roof
covering shall be completely removed before applying the new roof covering.New roofing conforming to Section 3209 shall be applied except that when
the new roof is to be applied directly to a nailable deck which has Residual
Bitumen adhering to it, a rosin-sized or other dry sheet shall be installed
prior to the installation of the new roof system.
The building official may allow existing roof coverings
to remain when inspection or other evidence reveals all of the following:
That the roof structure is sufficient to sustain the weight of the additional
dead load of the roof covering.
There is not more than one existing roof covering on the structure.
The existing roof covering is securely attached to the deck.
The roof deck is structurally sound.
The existing insulation is not water soaked.
B.)Preparation of Roof and
Application of New Covering
reroofing without removal of existing roof covering is permitted by the building
official and when the conditions specified in the exceptions to Subsection (a)
above have been met, the reroofing shall be accomplished in accordance with the
Gravel-Surfaced Roof Coverings
gravel-surfaced roof coverings, the roof shall be cleaned of all loose gravel
and debris.All blisters, buckles
and other irregularities shall be cut and made smooth and secure.Minimum 3/8-inch insulation board shall be nailed or securely cemented to
the existing roofing with hot Bitumen over which a new roof complying with
Section 3202 shall be installed.When
insulation board is to be attached with hot Bitumen, the existing surface shall
on nailable decks only, all existing gravel shall be spudded off to provide a
smooth surface.All blisters,
buckles and other irregularities shall be cut and made smooth and secure.A rosin-sized or other dry sheet shall be installed and a base sheet as
defined in the code shall be mechanically fastened in place.New roofing conforming to Section 3202 shall be applied.
3.)Over Smooth or Cap Sheet
smooth or cap sheet surfaced roof coverings, all blisters, buckles and other
irregularities shall be cut and made smooth and secure.In the case of non-nailable decks, a base sheet shall be spot cemented to
the existing roofing.New roofing conforming to Section 3203 shall be applied.
the case of nailable decks, a base sheet shall be nailed in place.In those cases where residual materials may cause the new base sheet to
adhere to the old roof, a rosin-sized dry or other sheet shall be installed
under the base sheet.New roofing
conforming to Section 3203 shall be applied.
Vent flashings, metal edgings, drain outlets, metal counter-flashing and collars
shall be removed and cleaned,rusted
metal shall be replaced.Metal
shall be primed with cutback primer prior to installation.Collars and flanges shall be flashed per the roofing manufacturer’s
All concrete and masonry walls shall be completely cleaned and primed to
receive new flashing.All vertical
walls, other than concrete or masonry, shall have the surface finish material
removed to a height of approximately 6 inches above the deck new roof surface to
receive new roofing and flashing.All
rotted wood shall be replaced with new materials.Surface finish material shall be replaced.
Parapets of area separation walls shall have
noncombustible faces, including counter-flashing and coping materials.
EXCEPTION:Combustible roofing may extend 7 inches above the roof surface.
space permits, cant strips shall be installed at all angles.All angles shall be flashed with at least two more layers than in the new
roof with an exposed finish layer of inorganic felt or mineral surfaced cap
Based on inspection of the existing roofing, the building official may
permit the recovering of existing shingle or shake roofing in accordance with
the provisions of this section.
Not more than two overlays of asphalt shingles shall be applied over an
existing asphalt shingle roof.
more than two overlays of asphalt shingle roofing shall be applied over wood
shingles. Asphalt shingles applied over wood shingles shall have an
overlay underlayment of not less than Type 30 non-perforated felt.
structures with a slope of 2:12 or greater and having no more than one existing
built-up roof with gravel surface, the gravel must first be spudded off to
provide a smooth surface.All
blisters and irregularities shall be cut and made smooth and secure and an
underlayment of not less than Type 30 non-perforated felt shall be installed.If the built-up roof has a smooth or cap sheet surface, all blisters and
irregularities shall be cut and made smooth and secure and an underlayment of
not less than Type 30 non-perforated felt shall be installed.
C.)Wood Shake Application
Not more than one overlay of wood shakes shall be applied over an
existing asphalt shingle or wood shingle roof (with one layer of 18-inch, Type
30 non-perforated felt interlaced between each layer of shakes).
Not more than one overlay of wood shingles shall be applied over existing
New roof covering shall not be applied over an existing shake roof.
Rusted or damaged flashing, vent caps and metal edgings shall be replaced
with new materials as necessary.
Tile roofs may be applied over existing roof
coverings when approved by the building official.Such installation shall be substantiated by structural data indicating
that the existing or modified roof framing system is adequate to support the
additional tile roof covering.
tile roofing shall be removed and cleaned. Damaged or rusted flashing and
cracked or broken tile shall be replaced.Tile
shall be applied in accordance with the requirements of Section 3208 (b) 5
(application of clay or concrete tile) and in conformance with the original
the original manufacturer's specifications are no longer available, the tile may
be reinstalled to match the prior installation except when clay and terra-cotta
hips and ridge tile shall be reinstalled with portland cement mortar.
MV Roofing Inc. dba Mission Valley Roofing is a California Corporation - CSLB Lic# 1057584