3.03
3.04
and date of work performed shall be affixed to the structure in a readily-visible location,
and a final written report shall be provided to Owner and Engineer detailing the location,
date of report, and description of liner installation.
Cementitious coating shall be installed in strict accordance with the manufacturer’s
installation instructions, including those for materials handling, on-site mixing,
environmental controls, working time, working temperature, safety, and spray equipment.
Water shall only be added to the materials during the mixing process and prior to material
pumping or spray application; water shall not be added at the nozzle. Cementitious base
coat shall only be installed via low-pressure application. The cured base coat surface shall
be troweled smooth and continuous with proper sealing connections to all unsurfaced areas.
The total thickness of the cementitious base coat shall be in accordance with the epoxy
lining manufacturer’s recommendations and the following minimum requirements:
1. For all brick manholes and for block or cast concrete manholes in poor
condition with notable loss of surface material or exposed reinforcing, apply to a
minimum thickness of 1 inch.
2. For block or cast concrete manholes in fair condition, apply to a minimum
thickness of 0.5 inch.
3. For block or cast concrete manholes in good condition with no loss of
surface material, it may be acceptable to apply the epoxy top coat directly to the
manhole surface without applying a cementitious base coat if the Contractor
confirms that the existing manhole surface meets the requirements of the epoxy
top coat manufacturer.
MANHOLE INVERT RECONSTRUCTION:
Where ordered by the Engineer, manhole channels, inverts and benches shall be
constructed of brick. Invert construction shall comply with the City of Nashua
requirements found in the Standard Specifications for Sewers and Drains available at the
City Engineering Department or on line at www.NashuaNH.gov under Public Works
Department, then Engineering Department, and the Standard Sewer Details on the plans.
All debris shall be decanted and disposed of at the City landfill.
SEWER MANHOLE INSIDE DROP ASSEMBLY:
Drop pipe and bowl shall be connected to the pipe(s) entering a manhole using
manufactured couplings or fittings.
2019 CIPP Lining Project Manhole Rehabilitation
Nashua, NH 02800-8
