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<TITLE>Re: Fraxinus ssp plugging drainage pipe</TITLE>
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<P><FONT SIZE=2>I have had experience of Fraxinus and lilac plugging drainage and sewer pipes. Fraxinus are in general terms quite invasive. There is a lot of research on tree roots and buildings including by DF Cutler and Ian Richardson a book written in the 80s called Tree roots and Buildings based on research carried with Building Research Establisment and Kew Tree Root Survey after the 1987 storm. Cutler and Richardson found frequency of damage recorded by Fraxinus was that 50% of cases occured within 6m of the building on shinkable clay and that the percentage of cases of damage by Ash trees involving shrinkable clays : more than 99% <BR>
Damage to drains of Ash was involved in 4.5 %<BR>
But the note is that when damage occured to foundations that drains had been damage<BR>
as well. The other research is Dr Giles Biddle and the British Standard Institute and BRE Digest 298. I know there has been a lot more work done on this. Ian Richardson and Cutler also had a tree root identification book which is a good source as is Tree Below ground series by Dr Gary Watson. Regards Mark Burleton.<BR>
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Sent: Tue Apr 08 12:00:23 2008<BR>
Subject: CANUFNET Digest, Vol 41, Issue 2<BR>
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Today's Topics:<BR>
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1. Frazinus ssp. -do their roots plug drainage systems<BR>
(Tony Puddicombe)<BR>
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Message: 1<BR>
Date: Mon, 7 Apr 2008 10:08:13 -0700<BR>
From: "Tony Puddicombe" <puddicombe@telus.net><BR>
Subject: [CANUFNET] Frazinus ssp. -do their roots plug drainage<BR>
systems<BR>
To: <canufnet@list.web.net><BR>
Message-ID: <000d01c898d1$f70313e0$3aaa9b4b@puddicombe><BR>
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Does anyone have experience with Fraxinus ever having entered and<BR>
plugged perforated drainage pipe? I assume the deeper the pipe the less<BR>
chance of it happening. I am only familiar with Salix, and sometimes<BR>
Thuja plicata, doing this. My feeling is that a tree's roots would not<BR>
search out drain tiles unless it was suffering drought conditions. The<BR>
water held in the soil is a much more constant supply with adequate<BR>
rain.<BR>
My client has a neighbour whose house foundations are 15 feet from the<BR>
base of a 35 foot high Fraxinus. The foundations are 3 feet below<BR>
finshed grade. The neighbour worries the trees roots will grow into her<BR>
perimeter drain pipes. Any comments?<BR>
Tony Puddicombe<BR>
Arboriculture consultant PNW #0400A<BR>
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