GEORGIA WDO FINAL PAPER 2025/2026 QUESTIONS WITH
ANSWERS GRADED A+
✔✔T/F: Is inadequate ventilation a conducive condition on the Georgia WDI form? -
✔✔Yes! (True)
✔✔Question #1 - How many standard vents (8" x 16") would be needed to meet the
International Residential Building Code for a residential crawl space structure that is 65'
long by 30' wide without a vapor barrier?
2
10
15
20 - ✔✔1. 65*30 = 1950 (square footage of crawl space)
2. 1950/150 (since the crawlspace has less than 70% vapor barrier) = 13
3. 13 * 144 (square inches in a foot) = 1,872
4. 1,872/128 (size of the 8X16 vent) = 14.625
5. Since you can't have .625 of a vent you round up to 15
✔✔Question #2 - If that structure in Question #1 had 15 standard vents with a vent
within 3' of each corner of the structure, no vapor barrier and the wood was treated with
a product that is labeled for control of Powder Post Beetles, would that meet the
treatment standard in the Rules of the Structural Pest Control Commission for control of
Powder Post Beetles?
YES
NO - ✔✔Why NO? Well...remember that in order for it meet the treatment standard for
Powder Post Beetles in the Rules of the Structural Pest Control Commission, at least
70% of the soil in the crawl space would need to be covered by a Class 1 vapor barrier
(4 mm), ventilation would have to meet the requirements of the International Residential
Building Code and the wood of the crawl would have to be treated with a product that is
labeled for the control of Powder Post Beetles. It met the standard for the International
Residential Building Code, the wood of the crawl was treated with a product that was
labeled for control of PPBs, but the crawl space had no vapor barrier. If a vapor barrier
covered at least 70% of the soil of the crawl, then it would have met the standards.
✔✔How many standard vents would be needed to meet the International Residential
Building Code for a 1,500 square foot residential crawl space structure that has a 4 mm
vapor barrier that overlaps by 6" and is taped, provides 100% coverage of the soil of the
crawl space, and extends up the exterior foundation walls by at least 6" and is taped
and secured to the exterior foundation walls and has mechanical exhaust ventilation
that meets the International Residential Building Code?
0
2
4
24 - ✔✔0!
,✔✔Question #9 - Which of the following are the 3 conditions which are conducive to
wood destroying organism infestation and must be reported on an Official Georgia
Wood Infestation Inspection Report when you find it on a home that you are inspecting
for the sale of the property?
1. Wood within 6" of the soil
2. Wood touching the soil
3. Cellulose debris in the crawl space
4. Inadequate ventilation - ✔✔Wood touching the soil, cellulose debris in the crawl
space, and inadequate ventilation
*Wood within 6" of the soil that is not treated for ground contact must either be removed,
properly insulated or Waived using the Official Waiver form for the prevention or the
control of subterranean termites, but untreated wood must be touching soil to be
considered a condition which is conducive to wood destroying organism infestation on
an Official Georgia Wood Infestation Inspection Report.
✔✔When do Lyctid (true powerpost beetles) usually emerge? - ✔✔December to early
spring
✔✔When do Anobiid beetles usually emerge? - ✔✔April to June
✔✔Old House Borer - ✔✔June to August
✔✔Exit size holes and shapes of beetles (LABO) - ✔✔Lyctid: Round shape 1/32-1/16
Anobiid: round, 1/16-1/8
Bostrichid: round, 1/8-3/8
Old House borer: oval, 1/4-3/8
✔✔Feel & Consistency of Frass - ✔✔Lyctid = very fine (like flour or baby
powder) & loosely packed
Anobiid = gritty (fine powder and small,
bun-shaped pellets, loosely packed
Bostrichid = fine to coarse powder, tightly packed
Old House Borer = very fine powder and
tiny pellets, tightly packed in galleries
✔✔Type and Age of Wood (LABO) - ✔✔Lyctid = usually new, but occasionally old
hardwood
Anobiid = usually old, but occasionally new
softwood & hardwood
, Bostrichid = new softwood & hardwood
Old House Borer = usually new, but occasionally
old softwood
✔✔Size of the Reinfesting Wood Destroying Beetle Adult (LABO) - ✔✔Lyctid = Little
Lyctid = up to ¼" in length
Anobiid = Average Anobiid = up to 1/3" in length
Bostrichid = Big Bostrichid = variable, 1/8" to ¾"
in length
Old House Borer = Oversized Old House Borer =
from 5/8" to 1¼" in length (3/4")
✔✔Size of the Reinfesting Wood Destroying Beetle Larva (LABO) - ✔✔L ittle Lyctid =
up to ¼" in length
A verage Anobiid = up to 1/2" in length
B ig Bostrichid = variable, 1/2" to 1" in length
O ver-sized Old House Borer = up to 1¼"
to 1½" inlength
✔✔Moisture Requirements of Wood Destroying Beetles in Structural Wood - ✔✔Lyctid
= 6% to 30%
Anobiid = 13% to 30%
Bostrichid = 13% to 30%, some species
higher
Old House Borer = at least 13%
✔✔Types of Wood Products Attacked By Reinfesting Wood Destroying Beetles -
✔✔Lyctid = lumber and newly manufactured
products (cabinets & flooring),
usually found inside structures
Anobiid = Manufactured products,
structural timbers and lumber
(often found in crawl spaces)
Bostrichid = Manufactured products,
structural timbers and lumber
Old House Borer = Structural timbers and
lumber
✔✔This beetle only infests hardwoods - ✔✔Lyctid
ANSWERS GRADED A+
✔✔T/F: Is inadequate ventilation a conducive condition on the Georgia WDI form? -
✔✔Yes! (True)
✔✔Question #1 - How many standard vents (8" x 16") would be needed to meet the
International Residential Building Code for a residential crawl space structure that is 65'
long by 30' wide without a vapor barrier?
2
10
15
20 - ✔✔1. 65*30 = 1950 (square footage of crawl space)
2. 1950/150 (since the crawlspace has less than 70% vapor barrier) = 13
3. 13 * 144 (square inches in a foot) = 1,872
4. 1,872/128 (size of the 8X16 vent) = 14.625
5. Since you can't have .625 of a vent you round up to 15
✔✔Question #2 - If that structure in Question #1 had 15 standard vents with a vent
within 3' of each corner of the structure, no vapor barrier and the wood was treated with
a product that is labeled for control of Powder Post Beetles, would that meet the
treatment standard in the Rules of the Structural Pest Control Commission for control of
Powder Post Beetles?
YES
NO - ✔✔Why NO? Well...remember that in order for it meet the treatment standard for
Powder Post Beetles in the Rules of the Structural Pest Control Commission, at least
70% of the soil in the crawl space would need to be covered by a Class 1 vapor barrier
(4 mm), ventilation would have to meet the requirements of the International Residential
Building Code and the wood of the crawl would have to be treated with a product that is
labeled for the control of Powder Post Beetles. It met the standard for the International
Residential Building Code, the wood of the crawl was treated with a product that was
labeled for control of PPBs, but the crawl space had no vapor barrier. If a vapor barrier
covered at least 70% of the soil of the crawl, then it would have met the standards.
✔✔How many standard vents would be needed to meet the International Residential
Building Code for a 1,500 square foot residential crawl space structure that has a 4 mm
vapor barrier that overlaps by 6" and is taped, provides 100% coverage of the soil of the
crawl space, and extends up the exterior foundation walls by at least 6" and is taped
and secured to the exterior foundation walls and has mechanical exhaust ventilation
that meets the International Residential Building Code?
0
2
4
24 - ✔✔0!
,✔✔Question #9 - Which of the following are the 3 conditions which are conducive to
wood destroying organism infestation and must be reported on an Official Georgia
Wood Infestation Inspection Report when you find it on a home that you are inspecting
for the sale of the property?
1. Wood within 6" of the soil
2. Wood touching the soil
3. Cellulose debris in the crawl space
4. Inadequate ventilation - ✔✔Wood touching the soil, cellulose debris in the crawl
space, and inadequate ventilation
*Wood within 6" of the soil that is not treated for ground contact must either be removed,
properly insulated or Waived using the Official Waiver form for the prevention or the
control of subterranean termites, but untreated wood must be touching soil to be
considered a condition which is conducive to wood destroying organism infestation on
an Official Georgia Wood Infestation Inspection Report.
✔✔When do Lyctid (true powerpost beetles) usually emerge? - ✔✔December to early
spring
✔✔When do Anobiid beetles usually emerge? - ✔✔April to June
✔✔Old House Borer - ✔✔June to August
✔✔Exit size holes and shapes of beetles (LABO) - ✔✔Lyctid: Round shape 1/32-1/16
Anobiid: round, 1/16-1/8
Bostrichid: round, 1/8-3/8
Old House borer: oval, 1/4-3/8
✔✔Feel & Consistency of Frass - ✔✔Lyctid = very fine (like flour or baby
powder) & loosely packed
Anobiid = gritty (fine powder and small,
bun-shaped pellets, loosely packed
Bostrichid = fine to coarse powder, tightly packed
Old House Borer = very fine powder and
tiny pellets, tightly packed in galleries
✔✔Type and Age of Wood (LABO) - ✔✔Lyctid = usually new, but occasionally old
hardwood
Anobiid = usually old, but occasionally new
softwood & hardwood
, Bostrichid = new softwood & hardwood
Old House Borer = usually new, but occasionally
old softwood
✔✔Size of the Reinfesting Wood Destroying Beetle Adult (LABO) - ✔✔Lyctid = Little
Lyctid = up to ¼" in length
Anobiid = Average Anobiid = up to 1/3" in length
Bostrichid = Big Bostrichid = variable, 1/8" to ¾"
in length
Old House Borer = Oversized Old House Borer =
from 5/8" to 1¼" in length (3/4")
✔✔Size of the Reinfesting Wood Destroying Beetle Larva (LABO) - ✔✔L ittle Lyctid =
up to ¼" in length
A verage Anobiid = up to 1/2" in length
B ig Bostrichid = variable, 1/2" to 1" in length
O ver-sized Old House Borer = up to 1¼"
to 1½" inlength
✔✔Moisture Requirements of Wood Destroying Beetles in Structural Wood - ✔✔Lyctid
= 6% to 30%
Anobiid = 13% to 30%
Bostrichid = 13% to 30%, some species
higher
Old House Borer = at least 13%
✔✔Types of Wood Products Attacked By Reinfesting Wood Destroying Beetles -
✔✔Lyctid = lumber and newly manufactured
products (cabinets & flooring),
usually found inside structures
Anobiid = Manufactured products,
structural timbers and lumber
(often found in crawl spaces)
Bostrichid = Manufactured products,
structural timbers and lumber
Old House Borer = Structural timbers and
lumber
✔✔This beetle only infests hardwoods - ✔✔Lyctid
