How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manufactured and modular homes

How can trees damage a house?

Friday, August 31, 2018

The right types of trees strategically placed around a home provide numerous benefits beyond just shade and curb appeal. They hold the soil in place on a sloping site, provide a windbreak, and a habitat for birds and other backyard wildlife. Plus, some varieties provide flowers or fruit.

   But the wrong species of tree, or the right tree in the wrong location can cause minor to catastrophic damage to a home. Here’s some of the ways that trees can be detrimental:

•• Dead, diseased, or structurally defective trees can fall on the house. The tree in the photo above was sheared by lightning and, while still alive, will eventually topple. That cute tree hollow that’s home to the elves in cookie commercials is actually a structural defect that warrants removal of a tree. 


•• Branches overhanging the roof can fall, causing anything from a minor puncture to major structural damage. Also, leaves falling on a low-slope or flat roof can accumulate into a mat that blocks roof drainage and becomes acidic as it rots, which both stains and deteriorates the roof surface.

•• Leaves and small branches can clog gutters, causing water backup onto roof overhang areas and, in northern climates, ice dams.

•• Tree branches growing directly over the surface of the roof  sway back and forth in the wind and scrape away the the surface of shingles. If the home has a septic system, roots of trees nearby will follow the outflow of water backwards into the drainfield and, eventually, into the septic tank, clogging the system.

•• Trees close enough to a house that their roots can grow under the foundation, floor slab, porch, or patio may damage the structure. While large roots of some species can cause uplift, like in the photo below, it is more common that the leeching of water from under the structure by a maze of thirsty roots will cause settlement over time.

    Removal of the all the lateral roots near the surface of the soil on one side of a tree—during the construction of a new in-ground pool, for example—will weaken the tree’s resistance to lateral wind loads and cause it to fall in a storm. Also, trees that lean more than 15-degrees out of vertical may be dangerous, especially if they were originally growing vertically or there is uplifted soil on one side. Some species of trees that become unbalanced will develop a callous-like growth at the base on the weakened side called “reaction wood,” which is one way that a knowledgeable tree surgeon will recognize a problem.

    “You know, Gainesville is rated as one of the top ten cities for trees in U.S.,” says Robin Hargis, a certified arborist with Sky Frog Tree Service. “When I first moved here I thought I’d died and gone to heaven. But all those wonderful trees require maintenance.” It’s a good idea to look over all your trees periodically for any potential hazards, and large, older trees should be examined carefully from top to bottom. Robin also recommends having a professional  arborist inspect the trees on your property on a regular basis and whenever you notice an sign of a potential problem.


     If you suspect a problem, call a tree surgeon that is registered as a Certified Master Arborist with the ISA (International Association of Arboriculture)—which means that he or she has passed testing and is well-educated in tree growth, diseases, and proper pruning techniques.  

    Also, see our blog post Which trees are most likely to fall over on your house in a hurricane?


• • • • • • • • • • • • • • • • • • • • • • • • • • • 

Here’s links to a collection of our other blog posts about a home’s SITE:

Why do so many more sinkholes open up after a hurricane?

Should I seal the pavers at my patio and driveway or not? 

What is a flag lot?

How much is the ground required to slope away from a house? 

 How do I recognize structural problems in a retaining wall?  

What are the warning signs of a sinkhole? 

How can homebuyers protect themselves against buying a house over a sinkhole?  

What should I do about a tree with roots running under my house?

Will the electric company trim branches rubbing against the overhead service lines to my house?

•  What causes cracks in a driveway?

• What is my chance of buying a Florida home over a sinkhole?   

   Visit our SITE page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

Water Heaters

Water Heater Age

"What Are The

Signs Of..."

Septic Tank Systems

Structure and Rooms

Plumbing Pipes

Termites, Wood Rot

& Pests

Sinkholes

Stairs

When It First

Became Code

"Should I Buy A..."

Park Model Homes

Site

Shingle Roofs

Safety

Stucco

Remodeling

Wind Mitigation

Roof and Attic

"Does A Home

Inspector...?"

Pool and Spa

"What Is The Difference Between..."

Radon

Brick

Plumbing

Concrete and

Concrete Block

Metal Roofs

Foundations

Modular Homes

Rain Gutters

Mold, Lead & Other Contaminants

Condominiums

Older and

Historic Houses

Crawl Spaces

Mobile-Manufactured Homes

Building Permits

Life Expectancy

Clay Soil

Insurance

Floors

Insulation

Toilets

Exterior Walls

& Structures

Generators

Common Problems

HUD-Code for

Mobile Homes

Garages and Carports

Flat (Low Slope) Roofs

Electrical Panels

Sprinkler Systems

Electrical Receptacle Outlets

4-Point Inspections

Hurricane Resistance

Frequently Asked Questions (FAQ)

Home Inspection

Heating and Air Conditioning

Building Codes

Fireplaces and Chimneys

Inspector Licensing

& Standards

Energy Efficiency

Washers and Dryers

Electrical

Kitchens

Doors and Windows

(placeholder)

Cracks

Electrical Wiring

Click Below  

for Links

to Collections

of Blog Posts

by Subject

Plumbing Drains

and Traps

Appliances

Smoke & CO Alarms

Aging in Place

Top 5 results given instantly.

Click on magnifying glass

for all search results.

Bathrooms

Lighting

AFCI, CAFCI,

DFCI, & GFCI

Sinks

Air Conditioner & Furnace Age/Size

Attics

Electrical Switches

Siding

Search

This

Site

Water Intrusion

Electrical - Old

and Obsolete

(placeholder)

Foundation Certifications

Tiny Houses

About McGarry and Madsen

(placeholder)

Wells

Buying a home in North/Central Florida? Check our price for a  team inspection by two FL-licensed contractors and inspectors. Over 8,500 inspections completed in 20+ years. In a hurry? We will get it done for you.

Moisture Problems

Crawl Spaces

Bedrooms

Closets