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Sunroom Site Preparation

As long as you have a site that is fairly level, you shouldn’t have any problem preparing it, because the sunroom will be sitting upon 4 x 4 runners. If necessary, you can use bricks, concrete blocks, or pressure treated lumber (2 x 4, 2 x 6, or 4 x 4), cut to about 8”, as shims, to level it. Each runner should contact either the ground or the leveling materials at each end, and at least one point in the middle. After you’re done, make sure that the floor does not have any bounce to it.
 
Sunroom site preparation materials
 
It’s all right if your site is not perfectly level, because a slight grade will help water to drain from beneath the sunroom. Using shims to level it will also maintain a steady flow of air under the sunroom, which is important for keeping it dry inside. If you want to put skirting around the bottom, we recommend using lattice, or another ventilated material.
 
Ground that is too uneven can compromise the stability of the sunroom. As long as it is no more than 24” out of level, you can still shim it using concrete blocks, but make sure that the ground beneath the piers is level, and that each runner has at least four points of contact.
 
Dirt/Grass Base:   While it is not the best option, our sheds can also be placed directly on the ground if it has been leveled just like the other base materials (within 1-2 inches). We do not recommend this because dirt and grass are less supportive, may shift over time, and often exposes the foundation of your shed to additional moisture... all of which can reduce the lifespan of your shed. Our sheds are quite durable so this is still an option that can work for many situations, but we suggest that you take your climate into account, as well as any local codes that may apply, before deciding to use dirt or grass as your shed's base.
 
Depending upon your property, you may find it easier to dig out a level spot, instead of mounting the sunroom on posts. If you do it this way, be sure to dig out an area that is larger than the sunroom, leaving at least 12” around the sumroom perimeter. However, 24” is even better, because it will give you more room to build. Also, if the area that you dig out is deeper than a few inches, you can ensure that the ground will not eventually cave in against the sunroom by tapering the slope of the ground and planting grass to hold the dirt in place. You may also consider a retaining wall, but if you put it up before you build your sunroom, make sure that you leave enough room to work when you assemble the sunroom.
 
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