Greenhouse insulation Options for New and Existing Buildings

While it is unquestionably true that a site with a greenhouse is more visually stunning than one without one, the primary reason for having a greenhouse is to shelter one’s plants from the inclement climate during all four seasons of the year. Insulation is among the most critical elements of any greenhouse because we want as much of the energy that is put into the construction to remain inside the structure as possible. As a result, what information do you require regarding greenhouse insulation?

Greenhouse insulation ideas that are both ideal and functional

The first step in insulating a greenhouse is to seal off any drafts that may be present. That means that vents & doors should be properly installed, that gaps in the framework should be sealed, and that all damaged glass should be replaced.

Additionally, make certain that the ground covering is neatly tucked into the corners of all of your greenhouse’s walls. The few metres of carpeting you may have conserved on the edges may end up costing you several times more in the long run, both in terms of heating as well as weeding.

Insulation that reflects light

This type of Spray foam proportioner serves the primary aim of decreasing radiant heat transmission across those unoccupied open spaces, which is a substantial contributor to both heat gain in the summer & heat loss in the winter. These are intended to provide a surprisingly efficient and reasonably priced means of assisting in the maintenance of BTUs. It helps to keep mold, mildew, pests, & rodents at bay.

The northern end of the greenhouse will be insulated with foil to keep the heat in

The installation of insulation material foil on the northern side of the greenhouse ensures that the light and heat are returned to the greenhouse structure. The thermal insulation foil design, which consists of two layers of silvery foil wrapped around with a bubble polymer coating, is responsible for this activity.

When the Thermo foil is put on the interior of the greenhouse roof, it becomes feasible to keep the heat in for longer periods of time, which is beneficial.

Using Insulation at night

There are a variety of materials that can be used to trap heat build-up throughout the day in order to keep the greenhouse safe and warm at night. Thermal blinds & screens are examples of materials that are specifically designed to trap excess heat generated during the day. They can, however, be prohibitively expensive.

What exactly qualifies as effective greenhouse insulation?

Good insulation is what offers your plants a regulated atmosphere that allows them to grow in the ideal temperature and relative humidity for their particular environment. Regardless of the architecture of the greenhouses, proper installation will not only safeguard your valuable plants but will also allow you to reduce your energy consumption by a significant amount. Let’s take a deeper look at each and every component of the greenhouse that contributes to effective insulation.


Nowadays, polycarbonate sheets have earned a great reputation for their durability. It provides a wide range of advantages, particularly in the field of greenhouse insulation. It’s lighter, UV-resistant, flexible, and almost indestructible, making it an excellent choice for outdoor use. Even at temperatures as low as -40°F and so as high as 284°F, polycarbonate retains its excellent properties.

The primary source of heat loss is inadequately insulated sidewalls and roofs. The selection of the appropriate glazing for greenhouse insulation is so critical.

Seals for insulating materials

The heat that has accumulated throughout the day can be contained within the greenhouse at night to keep it from spreading. It is at this point that the seals between the frame as well as the panels become important. In order to avoid heat loss, certain greenhouses are equipped with rubber gaskets or silicone sealants. Several DIY gardeners use tape to seal the gaps, but this is only a short-term fix for preventing drafts.

The most effective long-term option for preventing drafts is to use a silicone sealer to plug up the cracks at the edges of the frame. Rubber sealing or glazing strips are required on vents, frames, and doors in order for them to close tightly. It is critical to keep drafts out of the greenhouse since they can cause irreversible damage to the plant if left unchecked.


You can insulate the outdoor border of your greenhouse with a piece of Styrofoam board (approximately 2 inches thick) or foam. It must be positioned vertically and extend at least one foot below the surface of the ground. A deeper foundation may be necessary if you live in zone 4 or a lower climate zone. In order to protect your greenhouse base, place the boards against the surface.