HomeMy WebLinkAboutResolutions - 1983.09.07 - 11769September 7th, 1983
Miscellaneous Resolution 33252
BY: PLANNING AND BUILDING COMMITTEE - Anne K. Hobart, Chdirper5on
IN RE: AUTHORIZATION TO RECEIVE BIDS - LAW ENFORCEMENT COMPLEX REROOFING
TO THE OAKLAND COUNTY BOARD OF COMMISSIONERS
Mr, Chairperson, Ladies and Gentlemen:
WHEREAS, the Law Enforcement Complex has been experiencing continuous problems
related to roof leakage; and
WHEREAS, an enqineering analysis, of the roof condition, has been completed; and
WHEREAS, the analysis has revealed that the general condition of the roof is poor
and that large areas of entrapped moisture or wet insulation indicates that leakage
problems will continue at an accelerated rate; and
WHEREAS, the heat loss alone, as a result of the wet insulation, is estimated to
cost $20,000.00 per year; and
WHEREAS, consultants recommend that the existing roof be removed and replaced; and
WHEREAS, the estimated cost of this project is $300,000,00.
NOW THEREFORE BE IT RESOLVED that the Department of Central Services be and is
hereby authorized to receive bids for the Jail Complex reroofing and a report thereon
be made to this Board after receipt and tabulation of such bids,
Mr. Chairperson, on behalf of the Planning and Building Committee, I move the
adoption of the foregoing resolution.
PLANNING AND BUILDING COMMITTEE
OAKLAND COUNTY EXECUTIVE
DEPARTMENT OF CENTOAL SERVICES
FACILITIES ENGINEERING DIVISION
JAIL REROOFING
Project 83-10 August 25, 1983
Construction on the Oakland County Jail began in 1969. The building was
completed and ready for occupancy in August, 1972. The roof structure
consists of precast concrete planks (floxicore units) which are more or less
level. A lightweight concrete fill of varying thickness provides slope to the
drains. The roofing system itself is a four-ply built-up installation
commonly referred to as tar and gravel. This system was applied in two
stages: the first, which allowed interior construction to proceed in a dry
environment; and the second, which was not applied until all work above the
roof and workmen from other trades had finally departed.
Over the years, the roof has performed satisfactorily. Periodic
inspections were made and any maintenance required was done in a timely
manner. In the past year and one half, the number and frequency of leaks
began to increase significantly. These were repaired immediately, but each
new rain brought new leaks thus prompting a thermographic (heat sensitive)
survey.
This survey revealed an almost totally (80 percent) saturated layer of
insulation. The presence of this moisture is attributed to two sources. The
first is moisture trapped during the original construction. The second is
ponded water entering through minute cracks in the coal tar pitch (tar).
Because of the staged construction of the system, there are two layers of
aggregatc and pitch. These layers become brittle and crack thereby allo win g
water to penetrate. When warmed, even by the sun, the pitch becomes slightly
viscous and has a tendency to be "self-healing." The hairline cracks then
become difficult, if not impossible, to locate and repair.
The Corps of Engineers estimates the average life of this type of roof to
be 12 years. Spot patching could continue at a cost of $10,000 to $12,000 pex
year to postpone the inevitable replacement. This cost would increase from
year to year and would do nothing about the heat loss (estimated to be $20,000
a year) through the wet insulation.
Instead, a complete removal and reroofing is being proposed. The
existing system would be stripped down to the concrete fill. If found to be
necessary, low spots in the concrete could be filled and other measures taken
to insure positive drainage. New insulation would be laid and a single ply
elastomeric (rubber) membrane installed. The entire system would be held down
by an egg-shaped rock ballast. Concrete pavers would be placed as walkways
for rooftop equipment maintenance, the flashing would be completely replaced,
and the drains lowered and relocated as necessary.
It is doubtful that a reroofing job of this magnitude and complexity
could be completed before the wet season. Rather than take that risk, it is
being proposed that drawings and specifications be developed for .bidding in
the spring. To the consultant's construction estimate of $245,000 should be
added a 10 percent contingency and an inflation factor to reflect 1984 prices.
The resultant total project cost is estimated to be $300,000,
At this time, authorization to prepare the necessary bidding documents,
advertise, receive bids, and report thereon, is being requested.
day of .414,
September 7th 19 83
LYNN Di'ALLEN, County Ch:!rk/Register of D.,1(
#83252 September 7, 1983
Moved by Hobart supported by Foley the resolution be adopted.
AYES: Pernick, Rewold, Wilcox, Aaron, Caddell, Calandro, Doyon, Foley, Fortino,
Gosling, Hobart, Jackson, R. Kuhn, S. Kuhn, Lanni, Law, McConnell, McPherson, Moffitt,
Moore, Nelson, Olsen, Page, Perinoff. (24)
NAYS: None. (0)
A sufficient majority having voted therefor, the resolution was adopted.
STATE OF MICHIGAN)
COUNTY OF OAKLAND)
I, Lynn D. Allen, Clerk of the County of Oakland and having a seal,
do hereby certify that I have compared the annexed copy of
Miscellaneous Resolution # 835 -2 adopted by the Oakland County Board of Commissioners
at their meeting held on September 7, 1983
with the original record thereof now remaining in my office, and
that it is a true and correct transcript therefrom, and of the
whole thereof.
In Testimony Whereof, I have hereunto set my hand and affixed the
seal of said County at Pontiac, Michigan
this