Important Winter Care Articles

We have published a few articles regarding winter care and maintenance, and suggest anyone who has purchased a structure from us to review them to make sure your shelter is safe over this winter. As always, we are available for anything you are wondering or concerned about. We would be happy to help.

Winter Care & Maintenance
Winter Storm and Your Structures
Putting up Structures After Snowfall
Weather Cautions
Cold Weather Poly Install
Temporary Fix for a Loose Cover
Retightening a Loose Cover
Installing Before Winter

Backyard Greenhouses

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 click here to download our backyard greenhouse brochure(please see pricing below)

This 12’W x 18’L High Profile Mini Greenhouse has a single layer of 6 mil plastic for the roof and ends.  It is used as a “season extender”.  To make it a year round structure a second layer of 6 mil plastic would be added to the roof, and an inflator fan kit would be supplied to blow air in between the layers.

This building sits on a 4” x 4” pressure treated beam (there are other environmentally friendly alternatives available as well), which is anchored into the ground.  Ventilation can be done manually  (through doors and windows or by adding roll-up sidewalls), or mechanically by adding an exhaust fan.

COLDFRAME vs. GREENHOUSE

COLD FRAME usually has a single plastic covered structure and used as a season extender
GREENHOUSE usually has a double plastic cover with air in between and sides that roll up for year round use and better heat efficiency.

AVAILABLE OPTIONS

  • Custom widths, heights & hoop spacing
  • Roof vents & forced ventilation packages
  • Various types & sizes of doors with end framing priced separately
  • 8mm polycarbonate sheeting for roof and/or ends
  • Roll up sides for natural ventilation & reduced condensation

Movable Structures

Please download our Movable Greenhouse Information or our movable brochure for printable versions of this information.
Or visit the movable application page for more details

Welded base is $11.00 per lineal ft of structure. That means if your structure is 36′ long, you would calculate 36 x $11 = $396.
Skis only are $5.80 per lineal ft of structure
Our prices exclude installation, foundation, freight & taxes unless otherwise specified. Please inquire with any concerns.

Please ensure you read the instructions and considerations  FULLY and understand all the points before considering purchasing a movable greenhouse.

The intent of this page is to point out concepts rather then discuss specifics. There are simply too many possibilities to cover them all. It is our purpose here to make sure you realize the possible consequences of some of your ideas and to point out potential pitfalls.

The idea of a moving structure allows a user, with a little creativity, to protect 2 or 3 times as much area with the same building and investment. It is a very simple concept as long as some basic guidelines are adhered to. If these guidelines are not followed, the building can easily sustain significant damage. The stress of pulling must be distributed evenly to eliminate or greatly minimize the risk of damage.

If you are moving a structure often or over longer distances, please call to discuss wheel optionsmovable skis

Click to see the photos below in a larger format with detailed descriptions

Livestock Shelters

30' wide on wall Livestock

 click here to download our livestock shelter brochure(please see pricing below) and see more info on our livestock shelter page

Pictured is a 30′ wide structure mounted on a knee wall. The short wall keeps the animals away from the plastic while also increasing the sidewall height. This particular customer has had several years of success using this sort of housing for his sheep.

Animals thrive in a greenhouse environment benefiting from being dry, out of the wind and in the light, without being in the direct sun.

There are a few options in covering to choose from. A typical kit is made from two layers of 6mil white poly and includes an inflator fan that blows air between the layers. This will reduce the condensation that the animals create. It also includes a single layer to cover each end and base brackets attach the structure to a wall.

Roll up sides are added for easy natural ventilation. Usually customers attach a snow fence or netting to the inside of the arch if the structure is mounted to the ground, so the animals do not come in contact with the cover or run away when the sides are rolled up.

Alternately, a white tarp covering may be used instead of the double white poly, especially in situations where the animals are going in and out on their own accord when they require shelter.

TARP vs. DOUBLE PLASTIC

The big difference is that with TARP you get extremely high tear resistance with low annual cover cost, and with DOUBLE PLASTICyou get reduced temperature fluctuation & drip control while adding stiffness in high winds.

AVAILABLE OPTIONS

  • Custom widths, heights & hoop spacing
  • Roof vents & forced ventilation packages
  • Various types & sizes of doors with end framing priced separately
  • 8mm polycarbonate sheeting for roof and/or ends
  • Roll up sides for natural ventilation & reduced condensation
  • Cross ties for added rigidity, support or other storage

Hanley Caterpillar Greenhouses

Click here to download our hanley tunnel brochure! (please see pricing below) or more info on our Hanley Application Page

Check out our Hanley Assembly overview 

We offer these structures with 17′ wide hoops at 6′ increments, standard.
Ultimate in Low Cost, Portable Season Extending Greenhouses

A note of caution…
At 6’ rib spacing, these structures are not intended to, or capable of handling very much snow load. This tunnel can handle greater loads by simply reducing the rib spacing and/or increasing the length of the anchor pegs.

Pricing can be done as a complete package or as “required components”
(prices as dependent on quantity purchased)

5/8” rebar (48” recommended)
Base plate with clasp
Rope (1000’ spools)
25’ or 28’ wide 6mil clear plastic

Sample prices, including plastic
17×100 @4 = $2659… sections are $98.35
17×100 @ 5 = $2254… sections are $102.70
17×102 @6  = $2019… sections are $107

 Our prices exclude installation, end anchors, freight & taxes unless otherwise specified. Please inquire with any concerns.

HST & Freight are extra, prices current as of June 2018 – please call for current quote

Structure details

17’ wide with 92” centre height
1”x2”x24’ galvanized 1 piece ribs
Ribs typically spaced at 6’ apart
5/8” rebar (2 per rib) 48” long suggested
1/4” polyester rope
Base plates with clasps

Additional Notes

It is important to get the correct amount of inward lean on the anchor rods. If they are too vertical, it will be a challenge to get the rib on and if they are leaning too much they will loose some of their holding power.

Proper tension on the rope is critical to the success this type of “greenhouse” since it is the rope which is holding the plastic in place. The plastic is secured lengthwise between 2 stakes which should be a minimum of 12’ away from the last rib. By pulling and securing the cover lengthwise first, you will minimize the cover dipping between the ribs.

We now have a modified Hanley which is narrower and taller, with a two part hoop. Pricing is available upon request. Due to the substantially different wind dynamic, the modified Hanley is not suggested as your first Hanley experience.

Igloo Round Structures

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 We have a unique structure that we have started offering more often. It is a round dome structure, with our standard hoops around a circular ridge piece. We have taken to calling this our “Canadian Igloo” Structure. Plastic is put on in separate pieces so it’s not for the new greenhouse assembler. We have them being used for everything from seminar areas to storage, whatever you would like a unique application for!

Interior Peak View

AVAILABLE OPTIONS

  • Anchor posts which are hollow steel tubes driven into the ground under each hoop
  • Brackets come with each anchor post to attach the base board (nuts and bolts included)
  • The heavy duty, galvanized peak bracket comes with the appropriate number of factory welded stubs
  • Hoops are rectangular galvanized steel, in one piece from top to bottom
  • Cover fastener channel with stainless spring steel inserts

Covering Details

  • Igloos typically covered with a single layer of 6mil poly and have a 5-6 year expected lifespan.
  • They can also be covered in a double layer poly, 12 mil tarp or lexan polycarbonate
  • 6mil clear greenhouse plastic comes with a 4 year warranty against deterioration by the sun.
  • White plastic should not be used for plants

Structure Components & Details

  • Base Brackets with 2 lag bolts each to attach to beam, curb, wall, etc (anchoring devices not included)
  • Welded circular ridge with U channel stubs
  • Spacers between the hoops
  • Wirelock to fasten the cover is composed of an aluminum channel with stainless steel spring inserts. It is included for both sets of end hoops. Sidewall wirelock is an optional extra.

Anchoring Options

  • Choice between Base Bracket (included in pricing seen in brochure) or Anchor Posts for anchoring
  • Anchor posts are an optional extra. These hollow steel tubes are 1 ¼ “ x 36” or 1 ¾ x 40”. There is one anchor post per hoop, usually set into concrete
  • Anchor posts are not advisable for very heavy or stony ground because of shifting
  • Anchoring the foundation is critical to the long term life of the building

Large Greenhouses

We have a variety of widths and lengths of greenhouse structures from which to choose.

If you’re just trying to get a head start on the garden vegetable season (and maybe extending the growing season by a couple of weeks) consider our free-standing structures which use just one layer of poly.

If your intent is to grow all year round and heat the greenhouse then you should be looking at our greenhouse packages that offer a double poly roof, inflator fan kit and roll-up sidewalls for better heat efficiency.

COLDFRAME vs. GREENHOUSE

COLD FRAME usually has a single plastic covered structure and used as a season extender
GREENHOUSE usually has a double plastic cover with air in between and sides that roll up for year round use for better heat efficiency.

AVAILABLE OPTIONS

  • Custom widths, heights & hoop spacing
  • Roof vents & forced ventilation packages
  • Various types & sizes of doors with end framing priced separately
  • 8mm polycarbonate sheeting for roof and/or ends
  • Roll up sides for natural ventilation & reduced condensation
  • Cross ties for added rigidity, hanging baskets or crop support

Retightening a Loose Cover

Previously we outlined how to do a temporary fix for loose cover. This should not be left for an extended period. Re-tightening a cover does not have to be done in one day.

  • The job MUST split into two parts lengthwise.
  • The cover must be pulled lengthwise BEFORE it is pulled from side to side.
  • Make sure you do the tightening process on a calm, warm day.
  • You should do the end which looks the worst first.
  • This job will require taking ALL of the cover fasteners out.

Taking a short cut will leave you with more wrinkles.
Areas with wrinkles will flutter more and cause stress points.
This will also cause the cover to deteriorate quicker.

When you are tightening the cover, you should always pull 90 degrees to the wrinkle.

This means that after you have secured at the peak,
most often you will be pulling diagonally to the corner.

Once you have done one end/half and the wind is still down, you can start loosing the fasteners on the other end and repeat the process until complete.

Please don’t hesitate to contact us if you have any questions.

You can also see additional information in our installation guide:
Tarp Covering Instructions
Plastic Covering Instructions
Wirelock & Side Wall Cover Fasteners
covering options

Temporary Fix for a Loose Cover

There are a number of instances where a cover will need to be installed in less than ideal conditions. This can be either be on a windy day or in the cold (-10C or worse) and the job simply can not wait.

This will almost invariably lead to a situation where the cover will need to be re-tightened on a warmer and/or calmer day. Doing this temporary fix will get you an extra month of time that you can wait until it warms up and you can do a better job retightening the loose cover.

The lifespan of a cover can very quickly be reduced if it is repeatedly flapping in the hard wind. A very effective, temporary fix to give you more time to do the job right, is to put ropes or straps over the building (as in the photos below)

A 1” or 2” wide seat belt type material is ideal but likely you will need to settle for a soft, marine grade rope instead. Using nylon rope is almost worse then using nothing because of the abrasion factor.

The idea is to put a strap or rope between pairs of hoops every 12’ to 16’ and pull as tight as you can. Use nails or eye bolts on your base as the spot for securing the ropes or straps.

If your cover is especially loose, it is best to install each of the ropes or straps snugly first. Then go back and tighten them as tight as you can. This will prevent you from pulling too much in one spot.

Please don’t hesitate to call if you have any questions about this technique. We would be happy to help clarify anything you need, to keep your building secure.

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Winter Care & Maintenance

These buildings are not industrial grade shelters and, as such, some caution must be exercised under some winter storm conditions….

Please see the WINTER CARE  page in our installation guide for additional information. We also have a Winter Care FAQ page with articles we have posted on this topic

Our structures are designed in a gothic shape with a slippery cover to be lightweight and snow resistant. This encourages the snow to slide off quickly.
This is not an industrial high snow load building. We do our best to always point out applications where the capacity of the structure is being compromised. Extra hoops or thicker steel are an economical way to increase wind and snow load capacity. We take pride in the sturdy shelters we manufacture and supply, but must point out that we cannot warranty against weather conditions.

Snow removal, when occasionally required, is a simple task. Uneven snow loading is deceiving, since the total weight is not a problem but the lateral force can cause the hoops to distort.It is rare to have any significant snow build up on the roofs; however,

DO NOT GO INSIDE A BUILDING WHERE THERE HAS BEEN OBVIOUS STRESS!

Be aware of these scenarios where excessive snow build up is possible and damage could follow:
A wet snowfall followed by dropping temperatures
A building 90° to the prevailing wind (drifts could form on the backside of the building)
A building attached to and situated downwind of a taller building (significant drifting)

A building 90° to another building that has a higher roof, could cause a surge in snow weight when the snow on the upper roof slides off.

Preventative measures for excessive snow build up (where possible):

Build structures inline with the prevailing wind
Build structures level from side to side to create uniform shedding
Do not attach your building to a larger existing building

Install a heat source to melt the snow

Economical additions to increase your structure’s snow resistance:

Install cable or tubular cross-ties at each pair of hoops, to create a triangle (when using cables there is no need to put them under tension)
Place wooden or metal support posts under the ridge. These can be suspended from the ridge with no more than ½” ground clearance. This will provide support as soon as there is load and structure movement will not dislodge your supports.

Use closer hoop spacing for the first 12’ section away from another bigger building

Pointers for removing snow:

NEVER remove all the snow from one side and then the other
Remove the snow off the top of your building before using a machine (snow blower, etc) along the sides

Use a padded piece of 1×4 wood on a pole (create a “T” shape) as the best tool for gently bumping the inside of the cover

BEWARE of this sequence which creates a “worst case scenario”:

Freezing rain, followed by dropping temperatures, Lots of snow followed by rainfall. It is easy to triple the weight of the snow load in 30 minutes.

Please call us if you have any questions about any of this. Thank you

We look forward to helping you find your Shelter Solution!

Here at Multi Shelters we can work with you to fit whatever budget you have in mind for your project and publish sample prices freely for you to compare.

We have found a balance that provides the economy so many seek, while not sacrificing any quality of the structure or customer service.

Feel free to contact us for a custom quote for what you have in mind. We can work together to reach your goals. Flexibility is what we do at Multi Shelter Solutions.

Our biggest niche still remains that we don’t bend any steel before getting an order. We are able to customize it to fit in just the right spot, or alter how it’s done for your unique request. We bring almost 45  years of experience to each and every call or email that we receive from potential and existing customers and welcome standard as well as outside the box projects.

That factor is how we’ve come up with our “igloo” structure, the airplane hangars, our “flying” greenhouse that was lifted onto an apartment building, and more! We pride ourselves on being able to help you find your best shelter solution, no matter how “out there” an application may seem. We’ve seen pretty much everything and look forward to your project ideas and challenges.

Check out our application pages to get you started and start the ideas flowing, there’s many to choose from. Thank you for your interest in Multi Shelters and we look forward to hearing from you in 2019!