I have received a lot of calls and emails from Pest Management Professionals in affected areas concerning flooding from hurricanes and unusual weather conditions. The question is, “What about our termite customers in these areas that may have been flooded and experienced standing or moving water?
Help Customers Breathe Easy
In addition to preventing termites and other wood-destroying organisms (WDO) from settling in a structure, moisture control helps with indoor air quality, too.
Ask any pest control professional and they will tell you; everyday in the field is different. From reptiles to insects to unwanted rodents, you name it, they’ve probably seen it. Sometimes, though, extreme conditions require creativity, ingenuity and a unique departure from the usual practice. Mr. Pat Markey, a 35 year pest control veteran and owner of the Alexander City, Alabama Orkin franchise, faced a similar situation in the fall of October 2013.
// // Pest management professionals (PMPs) first began installing moisture ground barriers and ventilation back in the mid-1960s, after the then-National Pest Control Association, the U.S. Department of Housing and Urban Development (HUD) and the U.S. Federal Housing Authority (FHA) jointly made the first recommendation of using ventilation to remove excess moisture from crawlspaces.
Later, HUD developed the recommendation of 1 sq. ft. of ventilation per each 1,000 sq. ft. of surface area in the crawlspace area. Still later, the recommendation was amended to 1 sq. ft. of ventilation to 1,500 sq. ft. of surface area in crawlspaces when 70 percent to 80 percent of the ground surface was covered with polyethylene and vents were located on at least three sides of the crawlspace, allowing for cross-ventilation.
In 2000 the now-International Residential Building Code (IRBC) again changed the code to not require ventilation as the sole recommendation in crawlspaces. Below is the actual code as it applies to single residences:
Ventilation. The under-floor space between the bottom of the floor joists and the earth under any building (except space occupied by a basement or cellar) shall be provided with ventilation openings through foundation walls or exterior walls. The minimum net area of ventilation openings shall not be less than 1 square foot for each 150 square feet (0.67 m2 for each 100 m2) of under-floor space area. One such ventilating opening shall be within 3 feet (914 mm) of each corner of said building.
Openings for under-floor ventilation. The minimum net area of ventilation openings shall not be less than 1 square foot (0.0929 m2) for each 150 square feet (100m2) of under-floor space area. One such ventilating opening shall be within 3 feet (914mm) of each corner of the building. Ventilation openings shall be covered for their height and width with any of the following materials provided that the least dimension of the covering shall not exceed ¼ inch (6.4mm):
1. Perforated sheet metal plates not less than 0.070 inch (1.8 mm) thick.
2. Expanded sheet metal plates not less than 0.047 inch (1.2 mm) thick.
3. Cast iron grills or grating.
4. Extruded load-bearing brick vents.
5. Hardware clothe of 0.035 inch (0.89 mm) wire or heavier.
6. Corrosion-resistant wire mesh, with the least dimension being 1/8 inch (3.2 mm).
1. Where warranted by climatic conditions, ventilation openings to the outdoors are not required if ventilation openings to the interior are provided.
2. The total area of ventilation openings may be reduced to 1/1,500 of the under-floor area where the ground surface is treated with an approved vapor retarder material and the required openings are placed so as to provide cross-ventilation of the space. The installation of operable louvers shall not be prohibited.
3. Under-floor spaces used as supply plenums for distribution of heated and cooled air shall comply with the requirements of section M1601.4.
4. Ventilation openings are not required where continuously operated mechanical ventilation is provided at a rate of 1.0cfm (10m2) for each 50 square feet (1.02L/s) of under floor space floor area and ground surface is covered with an approved vapor retarder material.
5. Ventilation openings are not required when the ground surface is covered with an approved vapor retardant material, the space is supplied with conditioned air and the perimeter walls are insulated in accordance with Section N1102.1.7.
The IRBC did not do away with ventilation requirements. It just set up the five exceptions listed above. In another section of the code it does say the crawlspace has to be accessible, or there must be a way to get into the crawlspace.
The real problem is that the Energy Commission is recommending crawlspaces be closed or sealed.
Studies over the past 20 years have shown that in areas of the country where the relative humidity reaches more than 64 percent during certain periods of the year, open vents can allow more warm air into the crawlspace, increasing the moisture in that area. Closing the vents, covering the ground 100 percent with 6 mil clear polyethylene and covering the inside foundation walls up to four in. below the sill plate with clear 6 mil polyethylene, results in less moisture.
Provisions need to be made at the foundation wall ground junction for removal, if treatment for subterranean termites should ever become necessary. Installation of a dehumidifier may be recommended during this closed crawl procedure to quickly reduce the amount of moisture that can accumulate in the crawl space.
This map offers a visual of the areas of the U.S. where closed crawlspace procedures may be beneficial in reducing moisture in crawlspaces:
This map is an example and does not mean to indicate the relative humidity in any specific area. Areas 1, 2, 3 and 4 have a moisture potential that could be addressed by the closed crawlspace procedure.
Several state regulations still require ventilation, and in some states there are provisions for exceptions to ventilation. In some states, counties, parishes and cities, building permits may also be required. Check with your state rules, regulations and officials prior to initiating the closed crawlspace program in your market.
For addition information, visit these online resources:
They search for void spaces such as holes in trees, wood piles, rocks, stones and houses.
They do no damage, but are a nuisance pest.
Control at this stage is vacuum and remove if they are accessible. Seal entry points in structures if possible.
Take a look at some recent pictures from the field.
Eastern subterranean termites (Reticulitermes flavipes) typically swarm in the spring and early summer, but they are sometimes seen in the fall when the climate is right. This year the temperature dropped in early November, then warmed up with some rain. Temperatures and humidity between 68 to 72 create the conditions favorable for swarms, between the months of March and November.
As a side note, the HVAC system in a house can create the same environmental conditions. This can also send termites into the swarming mode.
These are pictures of a sizeable outside swarm of Southern subterranean termites (R. Hageni) in the south this past fall.
Images provided by Cory Kirkley on 12/09/2014, from Vidalia Georgia Orkin Specialist.
You do not have to be in the Pest Management Professional business to determine that crawlspaces do have a problem with moisture that leads to far bigger problems like termites, beetles, bores, fungus, rot, mold, and most noticeable a musky odor as well as crawling pest ants, roaches and miscellaneous insects. Read More
The old way of installing a foil radiant barrier was to roll out the foil material and staple it to the underside of the rafters from ridge to header. The problem is, this greatly increased the risk of “step-through” and ceiling damage as installers are required to crawl out onto existing insulation and into hard to reach places. Over time sheet foil radiant barriers tend to sag as the staples tend to pull out or tear through the material.
Solar-SNAP Radiant Barrier is manufactured with a “spring steel batten” installed across every 24” of material. The spring steel batten pushes or “SNAPS” into place between the joists to hold the product in place. The battens support the Solar-SNAP Radiant Heat Barrier across the whole width of material. This prevents drooping and or sagging. Over time, the spring steel battens “dig” further into the joists actually improving its hold. The Solar-SNAP Radiant Barrier allows the installer to do in half a day what used to take 2 days. This saves significant time while reducing possible damage to the structure.
Solar-SNAP Radiant Barrier does not impede ventilation within the attic. Air flows behind the radiant heat barrier from the eaves to the ridge vents. This reduces moisture buildup and mold or mildew problems. Spraying the underside of the roof structure prior to installation of the Solar-SNAP Radiant Barrier with UltraBan® or UltraBan-PRO® is recommended to condition the substrate against moisture damage.
Solar-SNAP Radiant Barrier is a product that is constructed with premium materials that are durable and even perforated to allow vapor transmission “breathable”.
Solar-SNAP Radiant Barrier deflects water damage from potential roof leaks by redirecting water to the eaves and away from ceilings and insulation.
Solar-SNAP Radiant Barrier is a favorite for the pest control industry because it may be easily removed for inspection, cleaning (dust on radiant barriers reduce their effectiveness), and repairs of leaks or damage. The radiant barrier is then replaced with a “SNAP”.
For more information about Rhino Hide’s Solar SNAP Radiant Barrier visit http://rhinohide.com/products/solar-snap
The good news, with all the termite treatments and use of the new technologies, we are yet to terminate all the native subterranean termites. Today, Patrick Markey found an active swarm in southern Alabama. Termites were inside a garage about 70 feet from main structure. (Perfect Storm for termite) Swarm conditions were ideal for a fall swarm. It had been cool for a few days, followed by rain. Then yesterday and today (10-28-14) the temperature got up to about perfect 80 degrees with a humidity about 70.
Results were, termite swarmer’s that were already in their established swarm castles thought it was time to swarm and swarmed just like they are supposed to do.
Do not forget to inspect all of the property and to include all buildings, construction such as wood fence, dog houses, barns and etc. When inspecting the house or main structure draw a basic diagram, inspection starting underneath or in basement, and including every floor and attic. List all your findings. This is a great time to take pictures and video of what you find. Inspection and Documentation is your friend.
The question you have asked is the bases for a good PMP article. Swarms After Treatments. Best I know there is little scientific data to prove this happens as a result of the treatment or not. In the field we have all experienced swarm within six week of new applications, and for whatever treason these are the first to swarm in the next swarm period either fall or early spring/summer depending on where you are located in relationship to the equator.
Old information’s lives forever weather right or wrong. Backing up to chlordane and heptachlor (hep·ta·chlor), the emulsifier in both products was xylene, this created vapor pressure, so when using either product singly or when they were combined like Orkil (Chlorhepton) or Termide you could get a flushing action from the heptachlor that has a vapor pressure of 10 which is much higher than chlordane.
Vapor from Dursban also had a vapor pressure that caused a flushing action after application. When Dow switched to water base and change the dilution this problem stopped.
All of the first generation pyrethroids also used xylene as their main emulsifier and they even created more vapor resulting after treatment swarms.
When termites swarm in structures in the same place as last year or swarm season. That generally mean for whatever reason that group (colony) was missed last year and the exception can be they found a moisture supply above ground, examples shower stall, wax ring, leaking, tub or shower, chimney, roof, pipe protruding through the sealing, clogged gutters or down spouts, ice dam, and just plain roof leaks at nail backup’s.
What do you think?