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ASTM Selected Technical Papers
Thermal Insulation, Materials, and Systems for Energy Conservation in the '80s
By
FA Govan
FA Govan
1
Vice President of Professional Services
,
Ziel-Blossom & Associates, Inc.
,
Cincinnati, Ohio
;
conference chairman and editor
Search for other works by this author on:
DM Greason
DM Greason
2
Research Leader
,
Foam Products TS&D, Dow Chemical USA
,
Granville, Ohio
;
conference vice chairman — Technical Program and editor
Search for other works by this author on:
JD McAllister
JD McAllister
3
Senior Mechanical Engineer
,
American Electric Power Service Corporation
,
New York, N.Y.
;
conference co-chairman and editor
Search for other works by this author on:
ISBN-10:
0-8031-0230-5
ISBN:
978-0-8031-0230-9
No. of Pages:
905
Publisher:
ASTM International
Publication date:
1983

Nondestructive techniues are being widely used to locate wet insulation in compact roofing systems. Now that wet insulation can be found, breather vents and so-called “breathable” membranes are being promoted to dry out wet insulation, thereby recovering its thermal effectiveness.

Our exposure tests in New Hampshire indicate that the above venting methods are all rather ineffective in drying sealed specimens of perlite and fibrous glass roof insulation. It would take many decades to dry our specimens at the rates we measured over the past two years.

Cross-ventilation within the insulation increased the rate of drying. For perlite insulation, the faster rate would still result in a drying time measured in decades. For fibrous glass insulation, the drying time was reduced to 13 years.

We have succeeded in drying fibrous glass insulation in a roof by removing the water with a vacuum cleaner. In a series of tests with a total duration of 134 h, about 0.42 m3 (110 gal) of water was removed from a 17-m2 (180-ft2) area of 38-mm (1.5-in.)-thick insulation. Before the water was removed the insulation had only 21 percent of its dry insulating ability; afterward it had 83 percent.

1.
Tobiasson
,
W.
, “
Roofs in Cold Regions
,” ASCE Preprint 80-172A,
American Society of Civil Engineers
, New York;
also available as
CRREL Miscellaneous Paper
 1408,
Hanover, N.H.
,
04
1980
.
2.
Korhonen
,
C.
and
Tobiasson
,
W.
, “
CRREL Roof Moisture Survey, Pease AFB Buildings 35, 63, 93, 112, 113, 120, and 220
,” Special Report 80-14,
U.S. Army Cold Regions Research and Engineering Laboratory
, Hanover, N.H.,
1980
.
3.
Tobiasson
,
W.
,
Korhonen
,
C. J.
, and
Dudley
,
T.
, “
Roof Moisture Survey, Ten State of New Hampshire Buildings
,” CRREL Report 77-31, Hanover, N.H.,
1977
.
4.
Tobiasson
,
W.
, “
Venting of Built-Up Roofing Systems
,” in
Proceedings
,
Sixth Conference on Roofing Technology
, April/May 1981,
Gaithersburg, Md., National Roofing Contractors Association
,
Oak Park, Ill.
, pp. 16-21;
also available as
CRREL Miscellaneous Paper
 1498,
Hanover, N.H.
,
04
1981
.
5.
Tobiasson
,
W.
,
Korhonen
,
C.
, and
Van den Berg
,
A.
, “
Hand-Held Infrared Systems for Detecting Roof Moisture
,” in
Proceedings
,
1977 Symposium on Roofing Technology
,
09
1977
,
Gaithersburg, Md.
,
National Roofing Contractors Association
,
Oak Park, Ill.
, pp. 261-271;
also available as
CRREL Miscellaneous Paper
 1390,
Hanover, N.H.
,
09
1977
.
6.
Tobiasson
,
W.
and
Korhonen
,
C.
, “
Summary of Corps of Engineers Research on Roof Moisture Detection and the Thermal Resistance of Wet Insulation
,” CRREL Special Report 78-29, Hanover, N.H.,
12
1978
.
7.
Jenkins
,
D. R.
,
Mathey
,
R. G.
, and
Knab
,
L. I.
, “
Moisture Detection in Roofing by Nondestructive Means: A State-of-the-Art Survey
,” Technical Note 1146,
National Bureau of Standards
,
Washington, D.C.
,
07
1981
.
8.
Tobiasson
,
W.
and
Ricard
,
J.
, “
Moisture Gain and Its Thermal Consequence for Common Roof Insulations
,” in
Proceedings
,
5th Conference on Roofing Technology
,
04
1979
,
Gaithersburg, Md.
,
National Roofing Contractors Association
,
Oak Park, Ill.
, pp. 4-16;
also available as
CRREL Miscellaneous Paper
 1361,
Hanover, N.H.
,
04
1979
.
9.
Knab
,
L. I.
,
Mathey
,
R. G.
, and
Jenkins
,
D. R.
, “
Laboratory Evaluation of Nondestructive Methods to Measure Moisture in Built-Up Roofing Systems
,” Building Science Series 131,
National Bureau of Standards
,
Washington, D.C.
,
01
1981
.
10.
Griffin
,
C. W.
,
Manual of Built-up Roof Systems
,
McGraw-Hill
,
New York
,
1970
.
11.
Baker
,
M. C.
and
Hedlin
,
C. P.
, “
Venting of Flat Roofs
,” CBD 176,
Division of Building Research, National Research Council of Canada
,
Ottawa
,
05
1976
.
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