Home Addition Plus

Helping Homeowners Every Day

    Home How-To Store Ebooks    Bid Sheets HouseSight About Us Contact





Home Addition Bid Sheet  


Home Improvement Tools from Amazon


Visit My


Tool Store







Sill Beam Repair and Replacement

Sill Rot is a Common Problem with Older Homes and Homes Built too Close to the Ground

By Mark J. Donovan

Question: Mark, I have an 8 foot section of sill beam in the front of my farm house that needs replacement. Evidently it has rotted out from years of splash back from the front granite stoop when rain water runs down from the single dormer above. Someone told me itís a simple repair and that the beam could be sprayed in place to effectively re-constitute it. How and who does one find details on this procedure, if it even exists.

Answer: P.P., Iím Sorry to hear about the rotting sill beam near your front stoop.


Sill rot is a common problem with older homes and homes with sill plates that sit close to the ground. Typically the sill rot occurs from the outside and works its way inwards. Roof runoff water splashes up off the ground, or in your case the front stoop, and works its way behind the house siding. If left unchecked, the home can settle dramatically over time which can lead to pitched or sagging floors and even structurally dangerous conditions.

Depending upon the level of sill rot and damage the costs to repair the sill beam can be quite expensive. Though there are some additive epoxy products on the market that you can use to strengthen wood, such as in the case of window sill repair, I am unaware of any type of epoxy system that can restore the level of strength necessary in a major structural component such as a sill beam. Yes there are penetrating epoxy sealers from Smith & Company, among others, on the market. However these products are meant more for preventing further rot rather than restoring the strength and integrity of a sill beam.


With older homes sill beams rest on the homeís foundation. Sill beams typically are quite large as they have to support and distribute the weight of the entire home. To repair a damaged sill beam correctly the home, or at least a portion of it, needs to be temporarily jacked up to expose the beam(s) and level the house frame. Once level, the section of old rotted sill beam can be replaced. Often, the foundation wall needs to be repaired in the process, particularly if it is constructed out of stone.


Jacking and lifting up the house is a cross between art and physics so it is wise to get a contractor experienced in this type of project.


If done incorrectly, your home could end up with cracks in the plaster walls and ceilings. In addition, the interior framing could twist or buckle. The trick is to raise the low areas of the sill beams to a pre-determined benchmark so that the home is in equilibrium and the frame structure is not stressed.

To determine the best course of action in your case you need to call in an old home restoration expert or an architect to inspect the state of your sill beams. They can then make the best recommendation for your particular situation. Unfortunately the cost of repairs will likely not be cheap. However, not addressing the issue could put you and your home at further risk, and lead to higher sill repair costs down the road.

Once the structural repairs have been made to the sill beam it is also important to address the issues that caused the sill rot in the first place. The installation of roof gutters, ice and water shield, moisture barriers, and flashing around the sill plates can help to eliminate splash back water from finding its way underneath your house siding. The soil grade around the homeís foundation can also be modified. Some of the soil can be removed and re-graded so that more of the foundation wall is exposed and roof run-off water is more quickly shed from around the foundation.


For a comprehensive new home construction checklist, see my New Home Construction Bid Sheet. The New Home Construction Bid Sheet provides a request for quote checklist section that you can provide to prospective building contractors. It also includes a comprehensive new home construction cost breakdown table, in Microsoft Excel format, that allows the contractor to include his projected new home construction costs for every phase of the project.


How to Finance your New Home Construction Project -  can help provide funds for your new home improvement project if financing is required.


Find Local Home Builders

Related Custom Home Construction and House Framing Articles



Additional New Home Construction and House Framing Resources



Custom Home Building Price Quotes For FREE, No Obligation!

Fill out our 3-5 minute quick and easy form, and receive a free price quote on custom home building from one of our prescreened and licensed custom home builders. This process is free and there is no obligation to continue once you receive your custom home building price estimate.






- Sill Beam Repair and Replacement -

[Back to Framing]



Follow HomeAdditionPlus on Twitter

to HomeAdditionPlusVideos / Subscribe to HomeAdditionPlus.com feed

Advertise / Favorite Links / SiteMap / ToS / Privacy Policy / Disclosure Policy

Copyright 2005-2016 by DIY HomeAddition Plus.com - A Do it Yourself Home Improvement Site



web metrics